— When do we need to pay the balance?
— ____  September 30.
A．InB．ByC．DuringD．Within
B

試題分析：考查介詞用法。In不能與具體的某一天連用；during在…期間；后面的賓語(yǔ)是一段時(shí)間；within在…之內(nèi)；通常與將來(lái)時(shí)連用；by不晚于…；到…時(shí)為止；句意：—我們需要何時(shí)付賬？—在9月30號(hào)之前。故B正確。
點(diǎn)評(píng)：本題考查了by的用法，表示不玩于…；在…之前；by另外一個(gè)重要的用法：by到…時(shí)為止；該詞經(jīng)常與完成時(shí)連用，如果后面是現(xiàn)在的時(shí)間，句中就使用現(xiàn)在完成時(shí)；如果后面是過(guò)去的時(shí)間，就使用過(guò)去完成時(shí)；如果后面是將來(lái)的時(shí)間，就使用將來(lái)完成時(shí)。
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