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The problem is _______ we can arrive there before 6:00 tomorrow morning.
A．whichB．whetherC．whenD．that
B
考查表語從句。從句we can arrive there before 6:00 tomorrow morning.不缺狀語不選when，只缺少起連接作用的詞而主語是The problem所以只能選whether。句意：問題是我們是否能明天六點前到那。
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