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
His grandfather is looking forward to ______ to his native place some day.
A. return
B. being returned
C. returning
D. be returning
单项选择题
______ from the top of the mountain, the city is very beautiful.
A. To see
B. Seen
C. Saw
D. Seeing
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