单项选择题

If you are worried （） the problem, you should do something about it.

A．with
B．for
C．on
D．about

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单项选择题

（） he is still working on the project, I don't mind when he will finish it.

A．In case
B．As long as
C．Even if
D．As far as

单项选择题

（） with the developed countries, some African countries are left far behind in terms of people's living standard.

A．Compare
B．To compare
C．Compared
D．Comparing

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