单项选择题

Many things have happened（）I saw you.

A．when
B．before
C．since
D．for

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单项选择题
（）cared about our sufferings like you.

A．Never before anyone has
B．Has anyone never before
C．Before has anyone never
D．Never before has anyone
单项选择题
It's high time we（）something to stop air pollution.

A．are doing
B．did
C．have to do
D．must do
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