题目内容
10．I don't know if Jack ．If he ，call me，please．（ ）| A． | will come； will comes | B． | comes； come | ||
| C． | comes； will come | D． | will come； comes |
分析 我不知道杰克是否会来．如果他来，请给我打电话．
解答 答案：D 根据选项内容和I don't know可知，考查宾语从句，if引导的是宾语从句，表示"是否"．当主句是一般现在时态，宾语从句应该根据需要选用任何时态．本句表示将要发生的事情，所以用一般将来时态；又因为If he…可知，if引导的是条件状语从句，当主句是祈使句，从句应该用一般现在时态，我们称这一现象为"主将从现"，主语是she，谓语动词用第三人称单数形式，故选D．
点评 本题考查宾语从句和状语从句，if引导的是条件状语从句，当主句是一般将来时态，从句应该用一般现在时态；if引导的是宾语从句，当主句是一般现在时态、含情态动词的句子或祈使句，宾语从句应该根据需要选用任何时态．
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