单项选择题

（） compels it, a body at rest will never move.

A．Until a force
B．Not until a force
C．A force
D．Force

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He often attends public lectures at the university of California chiefly （） his English.

A．to improve
B．as to improve
C．to import
D．expect for
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Many students suggested （） a boat trip on the Huangpu River.

A．to organize
B．organize
C．organized
D．organizing
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