单项选择题

Mr. Cook has not commented () these reports.

A. in
B. of
C. with
D. on

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单项选择题
It is () to stare directly at the sun.

A. harmful
B. harmless
C. comfortable
D. safe
单项选择题
() the garden, the old man went to have a rest.

A. Having been watered
B. Watering
C. Having watered
D. Being watered
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