单项选择题

Isn't it time you _________ some serious work before the examination

A．get down to
B．took up with
C．got off with
D．put down to
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单项选择题
You may leave it to _________.
A．we two
B．us two
C．our two
D．I two
单项选择题
_________ the snake in superstitious awe.
A．Mankind has held long
B．Long has held mankind
C．Has Mankind long held
D．Mankind has long held
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