单项选择题

Scarcely had he got to the office______ his boss wanted to see him.

A．until
B．than
C．then
D．when
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单项选择题
When you're driving on a motorway, you must obey the signs telling you to get into the right______
A．way
B．track
C．road
D．lane
单项选择题
We can rely on William to carry out this mission, for his judgment is always______.
A．effective
B．sound
C．subtle
D．healthy
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