单项选择题

We have been studying German ______ we entered this school.

A．as
B．since
C．while
D．because
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单项选择题
The general manager has requested that every department head ______ a meeting tiffs afternoon.
A．attended
B．attends
C．attend
D．to attend
单项选择题
If these trousers are too small, buy a bigger ______.
A．set
B．one
C．copy
D．pair
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