He could not __________ a right answer, ...

He could not __________ a right answer, so he felt very sad.

A. think about B. come up with

C. think over D. think to

B 【解析】试题分析：句意：他不能想出一个正确的答案，所以他感到非常难过。think about考虑；come up with想出，提出；think over仔细思考，反复考虑。结合句意和语境可知选B。考点：考查动词辨析。

考点分析：

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