the key to my door___.i have looked for it every where,but i still__it

题目

the key to my door___.i have looked for it every where,but i still__it
A is missing ;can't find
B has lost ; don't find
C has lost ; haven't found
D has been gone ; haven't found为什么选A

答案

the key to my door_is missing__.强调状态.表示到现在为止一直未找到.
i have looked for it every where,but i still_can't find _it 前边用现在完成时表示我已经到处找过了,但是（强调现在的状态）还不能找到它因此用can't.