单项选择题

（）, such problems concerning environment protection are not as easy to solve as they look.

A、Speak generally
B、To speak generally
C、Generally speaking
D、General speaking

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单项选择题
As a student in that famous school, Henry used to look hurt when（）

A、scolded
B、having scolded
C、to scold
D、scolding
单项选择题
We（）on it for many hours but we have not yet reached any conclusion.

A、work
B、have been worked
C、have been working
D、are working
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