单项选择题

If you cannot make up your mind （） destination to choose for your summer holidays, why not talk with our experienced travel consultants ？

A.whom
B.which
C.on
D.about

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单项选择题

Unfortunately, any benefits gained by lowering prices never （） if they are achieved by a reduction in quality.

A.last
B.pass
C.spend
D.retain

单项选择题

The company is pleased to announce that we have invited several members of our experienced （） and casual staff to become permanent employees.

A.minor
B.lengthy
C.temporary
D.duplicate

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