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

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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
单项选择题
Due to popular demand by the staff members, the scheduled talk by Mr. Smith will take place （） Room 15 instead of Room 20 as was first planned.

A.in
B.on
C.of
D.as
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