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【題目】We must find out ________ Karl is coming, so we can book a room for him.

A. how B. why

C. when D. where

【答案】C

【解析】

考查賓語從語的引導詞。句意：我們必須查明。根據后面的內容可知，“卡爾要來，我們可以為他訂一個房間”，可知，只有知道他什么時來了，才能給他訂房間，故選C項。

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