单项选择题

Everybody was required to keep the future plan in （）.

A. safety
B. secret
C. security
D. secrecy

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The manager is on the other phone. Will you hold （）for a minute or two

A. in
B. off
C. out
D. on
单项选择题
They lost their way, （）delayed them considerably.

A. which
B. that
C. it
D. so
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