He has not quite solved the problem yet, but he is ______ it.A、making ofB、worki

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问题 He has not quite solved the problem yet, but he is ______ it.

选项 A、making of
B、working on
C、clearing up
D、trying out

答案 B

解析本题测试的是动词词组词义的辨析。全句的意思是：“他还没有完全解决那个问题，但是正在努力。”make of意为“由……制成”；work on意为“从事于，致力于”；clear up意为“澄清，理清”；try out意为“尝试”。根据句意，应选答案B。

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Theproblemistoodifficultforme(solve)______.tosolve本题考查固定结构。此句中的结构为“主语+b