单项选择题

Immigrants have to adapt themselves culturally and physically to the new surroundings（）they have moved．

A．on which
B．by which
C．into which
D．from which

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单项选择题

The new drug will not be put on the market（）it has proved safe on humans．

A．if
B．until
C．since
D．when

单项选择题

According to the time table，the train for Beijing（）at 9:10 p.m. from Monday to Friday．

A．was leaving
B．is leaving
C．leaves
D．has 1eft

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