23-24高一下·全国·课前预习
1 . Some aspects of a pilot's job ________ be boring, and pilots often ________ work at inconvenient hours
A.can, have to | B.may, can | C.have to, may | D.can, must |
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2024高一下·全国·专题练习
2 . Black holes________not be seen directly so determining the number of them is a tough task.
A.can | B.should | C.must | D.need |
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