问题
选择题
______earlier, I' d have told you.
A．If I would have known it
B．Had I known it
C．If I knew it.
D．Should I know it
答案
答案：B
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______earlier, I' d have told you.
A．If I would have known it
B．Had I known it
C．If I knew it.
D．Should I know it
答案：B