My keys _____. I have looked for them everywhere but still _____ them.
答案是D are missing；haven’t found。为啥不是C have lost；haven’t found呢？为啥前一空不能用现在完成时呢？
My keys are missing I have looked for them everywhere but still haven’t found them.
Five people were missing in this accident.五个人在这场事故中失踪了。
I never found the missing piece.我一直没找到丢了的那件。
My gloves have been missing for ages.我的手套已经丢了很久了。
Two files have gone missing .两个档案不见了。
He lost his keys yesterday他昨天把钥匙弄丢了。
One of her legs was lost in a car crash她在一次车祸中失去了一条腿。