单项选择题

If it ______ more humid in the Desert of the Southwest, the hot temperatures would be unbearable.

A．be
B．is
C．was
D．were
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单项选择题
The man was under so much stress for such a long time that he finally ______.
A．broke down
B．broke up
C．broke out
D．broke in
单项选择题
Swimmers should avoid ______ ocean areas that are dangerous.
A．enter
B．to enter
C．entering
D．be entered
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