The problem is very difficult .You must think about it careful.这个句子错在哪里?

The problem is very difficult .You must think about it careful.这个句子错在哪里?

题目
The problem is very difficult .You must think about it careful.这个句子错在哪里?
可能错的地方在A .is B difficult.C .think about D .careful
为什么列?请说明原因
答案
D错.应为carefully,因为要用adv.(副词)来修饰v.(动词或动词词组).句子修该后应为:You must think about it carefully.此处carefully用来修饰think about.
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