单项选择 适中0.65 引用1 组卷270
We are going to the theater tomorrow ______ all the tickets are sold out.
A.when | B.unless |
C.whether | D.because |
2015·北京西城·二模
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Schools in the north tend to be better equipped, _______those in the south are relatively poor.
A.as | B.since | C.while | D.because |
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