【題目】What _______ headaches ?

A. causeB. is causeC. causesD. are cause

【答案】C

【解析】

句意：什么引起的頭疼？根據(jù)cause造成，引起，動詞，前面不能用be的形式，排除B/D；主語What看作是單數(shù)，謂語動詞用單數(shù)形式；故選C。

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