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1 . What is most extraordinary about the complex structures of Maya civilization is________ they were built without the use of wheels, metal tools or even animal power.
| A．why | B．how | C．where | D．when |
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2 . If you spend equal time studying each subject, the chances are ______ you may fail in the exam.
| A．how | B．what | C．when | D．that |
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3 . I’m afraid Tom is more of a talker than a doer, which is ______ he never finishes anything.
| A．why | B．when | C．where | D．that |
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4 . The greatest mystery is ______ caused the Maya to abandon most of their great cities.
| A．that | B．what | C．which | D．who |
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5 . The reason ________ he failed the English exam was ________ he didn’t work hard.
| A．that; that | B．why; that |
| C．why; because | D．that; because |
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6 . If you are addicted to your mobile phone, that’s ________ you should lay it down and be involved in meaningful activities.
| A．who | B．what | C．when | D．how |
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7 . I won’t go out today. This is________I am not feeling well.
| A．how | B．that | C．why | D．because |
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8 . Although Linda may not be a perfectly-behaved girl, her persistence has helped her become ________ she is today.
| A．what | B．which | C．that | D．where |
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9 . It seemed that Jim had become ________ his parents had wanted him to be.
| A．whether | B．where | C．what | D．when |
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10 . The question is ________ the film is worth seeing.
| A．where | B．that | C．whether | D．what |
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