________ anyone come to my office, please tell them I'm not available before four o’clock.
A．MightB．CouldC．WouldD．Should
D

試題分析： 句意：如果有人來到我的辦公室，請告訴他們在4點(diǎn)前我不在。這里用的是if虛擬語氣的省略倒裝，if anyone should come to my office,表示假設(shè)，這種虛擬條件句可以省略if，將should提前，其他幾個情態(tài)動詞might可能，could能夠，would將會，都不能用于虛擬條件句，所以選D。
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