单项选择题

______ I’d have told you.

A. If I would have known it B. If I had have known it
C. Had I known it D. Should I known it
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单项选择题
While I was waiting for her, I killed time ______ looking in the show windows.
A. by
B. with
C. in
D. with
单项选择题
In a second hand bookshop, Billy came across a book which he thought was certainly a ______ edition.
A. rare
B. scarce
C. seldom
D. hardly
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