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
By 2005 the population of our country ______ 13 millions.
A．will number
B．will be numbered
C．will have been numbered
D．will have numbered
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