单项选择题

______he was seriously ill, I wouldn't have told him the truth.

A. If I knew
B. Did I know
C. If I know
D. Had I known
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单项选择题
The reasons why birds don’t get lost on long flights______.
A. have been known to scientists for years
B. have only recently been discovered
C. are known by everyone
D. will probably remain a mystery
单项选择题
A. No, it’s not good. B. So do I. C. Yes, it is. D. I don’t know.
A. No, it’s not good. B. So do I.
C. Yes, it is. D. I don’t know.
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