1 . My grandparents dance square dances every day ________ bad weather stops them.
A.when | B.if | C.unless | D.once |
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2 . The concert was a great success — there wasn’t a single empty seat in the concert hall, ________ it was very cold.
A.although | B.unless | C.as | D.how |
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3 . You don’t have to take notes ________ I tell you to do so.
A.if | B.when | C.because | D.unless |
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