My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.
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A
would
B
should
C
could
D
might
推荐题目
. If only I ________ how to operate an electronic computer as you do. 
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A
had known
B
would know
C
should know
D
knew
If my lawyer ______ here last Friday, he _____ me from telling the truth.
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A
had been; would have prevented
B
had been; would prevent
C
were; would prevent
D
were; would have prevented