We are disappointed to know that by the time the delegate arrived, the meeting had_______started.

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问题 We are disappointed to know that by the time the delegate arrived, the meeting had_______started.

选项 A、still
B、already
C、once
D、yet

答案B

解析所有选项都是副词。still主要用于现在时；once用于过去时；yet主要用在否定句中。知道这些的话就能把错误答案一个个排除了。正确答案是用于完成时的already。

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