单项选择题

Helen did not go to bed early last night because she had to () for today's English test.

A. stay later
B. sat late
C. stay up
D. study later

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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
单项选择题
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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