It worried her a bit _________ her hair was turning grey.

A. while B. that C. if D. For

B

【解析】

試題分析：考察主語從句。這里是It+特殊動詞+that從句形式的主語從句，that在句中沒有實(shí)意，不做任何成分，只是起連接句子的作用。該句意思為：她頭發(fā)變的花白讓她很擔(dān)心。故選B

考點(diǎn)：考察主語從句。

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