单项选择题

The main road through the city was blocked for three hours today after an accident ______ two buses.

A．containing
B．connecting
C．including
D．involving
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单项选择题
Dirty water must not be ______ with drinking water.
A．joined
B．linked
C．mixed
D．combined
单项选择题
I know a number of occasions ______ people died from water pollution.
A．how
B．as
C．when
D．where
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