单项选择题

Nearly (three quarters) of the surface of the earth (are) covered with water, and there (would be) even less land (if) the polar icecaps were melted.

A．three quarters
B．are
C．would be
D．if
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(Many) unexpected problems (have been arisen) in the course (of) the reconstruction (of) the city.
A．Many
B．have been arisen
C．of
D．of
单项选择题
(Even though) Sandra (has been studying) English for three years (before) she came to the United States, it is difficult for her (to express herself).
A．Even though
B．has been studying
C．before
D．to express herself
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