单项选择题

Because weekend sailors can not always the wind, many sailboats have auxiliary engines.

A．bear upon
B．hold upon
C．count upon
D．come upon

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单项选择题

All the members of the committee agreed that Mr. Smith was the right person to hold such an important position. They made an ______ decision.

A．simultaneous
B．subsequent
C．unanimous
D．arbitrary

单项选择题

______ the center of our planetary system was considered as heresy by the church in the Middle Ages.

A．It is the sun and not the earth
B．That the sun and not the earth
C．Being the sun and not the earth
D．The sun and not the earth

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