单项选择题

Dirty water must not be ______ with drinking water.

A．joined
B．linked
C．mixed
D．combined
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I know a number of occasions ______ people died from water pollution.
A．how
B．as
C．when
D．where
单项选择题
Parking is a big problem, ______.
A．the traffic is so
B．is so the traffic
C．so the traffic is
D．so is the traffic
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