单项选择题

The American Civil War ______ in 1761.

A. broke out
B. broke down
C. broke away
D. broke into
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单项选择题
A quarrel broke ______ between father and son.
A. out
B. down
C. off
D. up
单项选择题
We must first make ______ with the parents of the missing children.
A. content
B. connect
C. contract
D. contact
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