is necessary that you start training a few months before the walk.A. This B. ThatC. What D. It 题目和参考答案——青夏教育精英家教网—

题目内容

is necessary that you start training a few months before the walk.

A. This B. That

C. What D. It

【解析】

试题分析：句意为：在走路之前你开始练习几个月是有必要的。这是一个主语从句，用形式主语it 代替真正的主语that you start training a few months before the walk.，以避免头重脚轻。故选D。

考点：考查it的用法。

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