单项选择题

______, he always tries his best to solve it.

A．Though difficult the problem is
B．However difficult the problem is
C．Though difficult is the problem
D．However the problem is difficult
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单项选择题
Thomas would have been more successful if he had studied harder, ______.
A．didn't he
B．wouldn't he
C．hadn't he
D．hasn't he
单项选择题
Some scholars have come ______ a new solution to the problem of population control.
A．up
B．up with
C．down
D．down with
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