单项选择题

Only through diplomatic means ______.

A．a formal agreement can be reached
B．can a formal agreement be reached
C．can be a formal agreement reached
D．can be reached a formal agreement
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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
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
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