5 when引导的时间状语从句的题目
Several weeks had gone by _____ I realized the painting was missing.
A. as B. before C. since D. when
这道题为什么选B不选D呢？当我意识到的时候，已经过了好几个礼拜了。但是答案是B before。before我也可以理解，但是我觉得D也是对的。
最佳答案 2023-09-27 16:32
Several weeks had gone by before I realized the painting was missing.
A. as B. before C. since D. when
解答：之所以用连词before引导时间状语从句是因为主句和从句有很明显时间间隔。主句谓语动词动作早于从句谓语动词动作发生，主句用过去完成时态，从句用一般过去时态。
Several weeks had gone by before I realized the painting was missing.
过了几个星期之后，我才意识到这幅画不见了。
备注：这是一道选择题，虽然when也OK,但是要选择最佳答案，所以选择before属于最佳答案。
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