------When do we need to pay the balance ?
------- ________September 30.
A.InB.ByC.DuringD.Within
B
句意為:什么時候我們需要付余額?到9月30日。在月日前應使用介詞on;而選項中沒有。During意為“在……期間”;within意為“在……內(nèi)”;by意為“(表示時間)不遲于; 在…時候”,因此B項最適合。
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