单项选择题

Our staff prefers to fly than to use other modes of transportation since it is much more （）.

A.optional
B.protective
C.excessive
D.convenient

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单项选择题
Some of our clients have complained that the time it takes to get a （） from a service representative is enough to make them not want to use our services again.

A.response
B.responding
C.responded
D.respond
单项选择题
They had to stop the production line for nearly two hours after a problem was discovered and the workers had to wait until they （） instructions from their superiors.

A.raised
B.received
C.persuaded
D.contended
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