-----Where ____ you put the ruler? I can't see it anywhere.
-----I put it right here. But now it is ____.
A．have, goneB．did, missedC．had ,goingD．will, missing

A

考察現(xiàn)在完成時(shí)態(tài)對(duì)現(xiàn)在的影響，missing丟失的'不能用missed代替。
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