(It is) (extremely) important (for) an engineer (to know) to use a computer.A、It

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问题 (It is) (extremely) important (for) an engineer (to know) to use a computer.

选项 A、It is
B、extremely
C、for
D、to know

答案 D

解析不定式用法错误，应改为to know how。know how to do sth．表示“知道怎样去做…”。 know之后往往不直接接to do sth．，而是采用“疑问词+不定式”的形式。类似的还有 learn(学习)。

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