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    【题目】______ he will visit our school or not tomorrow is still not decided yet. If he ______,David will show him around the school.

    A. If, will come B. If, comes

    C. Whether, comes D. Whether, come

    【答案】C

    【解析】C第一空用whether引导主语从句，译为“无论是否…”，if作“是否”讲时，不能引导主语从句置于句首。第二句if引导条件状语从句，用一般现在时代指将来时，主语是he，用第三人称单数形式comes，故选C。

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