单项选择题

Jupiter () perhaps the most important planet of the solar system.

A. was
B. were
C. is
D. will be

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单项选择题

Some people believe that King John was written by Shakespeare, but some people think it might be written by an ______ author.

A. delivered
B. anonymous
C. antique
D. ambiguous

单项选择题

Good pencil erasers are soft enough not () paper but hard enough so that they crumble gradually when used.

A. by damaging
B. so that they damage
C. to damage
D. damaging

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