单项选择题

The meeting was just getting to the heart of the matter （） it's time to knock off.

A. while
B. when
C. until
D. after

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单项选择题

英译汉：“dry basis”，正确的翻译为( )。

A．固形物
B．干物质
C．干态
D．净重

单项选择题

All products have to go ( )five checks in the whole process.

A. to

B. through
C. with

D./

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