单项选择题

______ such heavy pollution already, it may now be too late to clean up the river.

A. Suffering
B. Suffered
C. To suffer
D. Having suffered
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单项选择题
Unfortunately when I arrived she ______, so we only had time for a few words.
A. has just left
B. just left
C. had just left
D. was just leaving
单项选择题
—Do you mind if I smoke here —______.
A. Sure. Go ahead
B. Yes. Please
C. Yes I don't
D. No. Go ahead
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