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
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单项选择题
White surfaces reflect heat and light ______ black ones absorb them.
A．thus
B．whereas
C．hence
D．so
单项选择题
Tom is now working in London and is not ______ to driving on the left.
A．served
B．customed
C．accustomed
D．using
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