【題目】It is of great importance _______ parents say and do in family life, which may have a life-long effect on their children.

A. what B. that

C. how D. why

【答案】A

【解析】

試題分析：A.什么；B. 引導(dǎo)詞；C.表示方法和程度，怎么樣；D.為什么；

It為形式主語(yǔ)，真正的主語(yǔ)為what引導(dǎo)的從句，what在從句中作say和do的賓語(yǔ)。

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