单项选择题

Broadband (宽带) connections are widely available now, ________ makes online shopping much easier.

A．what
B．whatever
C．who
D．which
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单项选择题
In fact, there are different reasons ________ people are working long hours.
A．where
B．which
C．why
D．how
单项选择题
She was quite sure that she ________ the door before she left the office.
A．will lock
B．would lock
C．has locked
D．had locked
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