摘要：52．A．had known B．have known C．know D．knew
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________, I would have told you．
[ ]
A．If I knew it
B．Had I known it
C．If I know it
D．Did I know it
If I ________ her telephone number, I would have called her.
[ ]
|
A．had known |
B．has known |
|
C．knew |
D．know |
________ 
, I would have phoned you.
A．If I knew it B．Had I known it C．If I know it D．Did I know it