Because it is not a serious problem, we are not necessary to take strict measures against the student.

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问题 Because it is not a serious problem, we are not necessary to take strict measures against the student.

选项 A、we not need
B、not necessary for us
C、it being unnecessary
D、it is not necessary for us

答案D

解析 本题考查结构应用。当动词不定式作主语时,常用it作为形式主语放在句首代替真正的主语,结构为it is+形容词(for sb.)to do sth.。所以,答案是D。
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