单项选择题

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

A. Having suffered
B. Suffering
C. To suffer
D. Suffered

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A soldier has to learn to carry () orders as soon as they are given.

A. on
B. out
C. through
D. off
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Have a cup of tea, ().

A. shall we
B. will you
C. won't you
D. do you
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