I will have begun to do the work______5 o’ clock this afternoon.

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问题 I will have begun to do the work______5 o’ clock this afternoon.

选项 A、by
B、at
C、after
D、before

答案A

解析 句中will have begun提供了一个关键的解题线索,表明应该表示“将来截止时间”的介词,在本题中只有by有这种用法。
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