题目内容

_______ is necessary for you to lock the car when you don’t use it.
A．WhatB．ThisC．ItD．That
C
考查固定句型：it is+adj/n+to do,it是形式主语，不定式是真正的主语，句意：对你来说不用的时候把车锁上是很必要的。选C。
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