单项选择题

______from the top of the hill, the lake is just like a mirror.

A. Seeing
B. Having seen from
C. To see
D. Seen
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单项选择题
So many representatives ______ , the conference had to be put off.
A. were absent
B. to be absent
C. being absent
D. had been absent
单项选择题
The question is worth ______ again.
A. discussing
B. to discuss
C. discussed
D. discuss
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