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

A. This B. That

C. What D. It

 

D

【解析】

試題分析：句意為：在走路之前你開始練習(xí)幾個(gè)月是有必要的。這是一個(gè)主語從句，用形式主語it 代替真正的主語that you start training a few months before the walk.，以避免頭重腳輕。故選D。

考點(diǎn)：考查it的用法。

 

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