How long do you suggest is it ______ he arrived there?

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问题 How long do you suggest is it ______ he arrived there?

选项 A、when
B、before
C、after
D、since

答案D

解析注意do you suggest只是个插入语。本句可还原为：It+时间段+since he arrived there．注意since后所跟的动词形式，本题易误选before，但before引导的时间状语从句时态须和主句保持一致。

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