单项选择题

Probe Magazine conducted a survey asking one thousand employees who work in low-paying industries to express （） their biggest concerns are.

A.how
B.when
C.what
D.which

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单项选择题
The airline requested a （） call to ensure a seat on my flight back home.

A.confirm
B.confirmed
C.confirming
D.confirmation
单项选择题
The advertisements printed in this magazine do not （） imply endorsement by the management.

A.highly
B.barely
C.gradually
D.necessarily
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