If you__ in good health, I _you go on a trip yesterday（）
A. were, would have let
B. had been , would have let
C. had been , had let
D. were, had let
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You didn’t let me drive, If wein turn, you so tired（）
A. drove, didn’t
B. were driving, wouldn’t get
C. drove, wouldn’t
D. had driven, wouldn’t have got
If hehis doctor’s advice, he alive（）
A. had taken , might still have been
B. had taken , might still be
C. might have taken, had still been
D. took, might still be
____ go downtown this afternoon, please post the letter for me（）
A. Had you
B. Were you to
C. If you did
D. Shall you
n型半导体的基本特征为（）
A. EF＞Ei; n0Ei; n0＞p0
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