单项选择题

______ caused the accident is still a complete mystery.

A．How
B．That
C．Where
D．What
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单项选择题
I asked him if he had______oil.
A．any
B．some
C．an
D．much
单项选择题
The street is beautiful, for there are trees on______.
A．either side
B．neither side
C．both side
D．all sides
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