The scientists are beating their brains trying to ________ w

The scientists are beating their brains trying to ________ with a solution to the problem．
A.end up
B.come up
C.catch up
D.put up

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答案B
考查动词短语.本句话的意思为科学家们正绞尽脑汁地想找到一个解决问题的办法.end up with用……结束；come up with提出,拿出；catch up with赶上；put up with忍受.

1年前

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