单项选择题

______ the problems, the leaders should take the following points account.

A．When considered
B．While considering
C．Consider
D．Having been considering
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单项选择题
Studying carefully the clues in the passage, we learn that the total population of Africa is ______.
A．approximately seven hundred million
B．approximately one hundred and twenty-five million
C．approximately eight or eight point five thousand million
D．exactly twenty-four million
单项选择题
Being a sailor ______ long periods away from home.
A．spends
B．involves
C．leaves
D．includes
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