单项选择题

The secretary told me that they had run ______ typing paper.

A．down of
B．out of
C．up into
D．off from
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单项选择题
______ asking for leave from the teacher ,you should not go home.
A．If not
B．While not
C．When no
D．Without
单项选择题
White surfaces reflect heat and light ______ black ones absorb them.
A．thus
B．whereas
C．hence
D．so
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