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9.I would have told him the answer had it been possible,but

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9.I would have told him the answer had it been possible,but I ________ so busy then.
a.had been b.were c.was d.would be
10.He studied hard at school when he was young,________ contributed to his success in later life.
a.which b.therefore c.that d.so that
请选择,并讲讲原因.
9.I would have told him the answer had it been possible,but
C前面那句是虚拟,但是转折后这是个事实,所以必须是选C
Awhich引导的定语从句,代表前面整个句子