(2013·吉林四校高三一诊)I really don't know how to thank you, but for your help, I ________ my lost necklace.
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A
couldn't have found
B
mustn't have found
C
couldn't find
D
wouldn't find
推荐题目
 Without electricity human life ________ quite different today. 
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A
is
B
will be
C
would have been
D
would be
He hesitated for a moment before kicking the ball,otherwise,he  a goal.
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A
had scored
B
scored
C
would score
D
would have scored
-----Did Mary come to the party?---I don’t know.She _____while I was out.
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A
may have come
B
must have come
C
might come
D
could come