Yesterday I had a hard day and it was already dark______I left the laboratory.
A．by the time
B．as soon as
C．immediately after
D．halfway through

A.
A．by
B.as
C.immediately
D.halfway

【参考答案】

A
该句意为：昨天我累坏了，等我离开实验室时，天已经黑了。bythetime：截止到，等到……时(用于描写事情的......

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