单项选择题

We' ve got to report ( )to the head office.

A．on
B．in
C．back
D．/
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单项选择题
汉译英：“放射性检验证书；验残证书”，正确的翻译为：( )。
A．certificate of measurement; certificate of damage
B．certificate of radioactivity; certificate of damage
C．certificate of radioactivity; certificate of cleanliness
D．certificate of origin; certificate of eleanliness
单项选择题
ETA means ( )time of arrival.
A．excepted
B．export
C．estimated
D．exchange
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