单项选择题

()adequate preparations, we might have succeeded.

A. Would we make
B. Had we made
C. If we are to make
D. If we were making

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The American Red Cross is one of the volunteer organizations () purpose is to help the sick and the needy.

A. its
B. that
C. who
D. whose

单项选择题

I'll tell you the secret, but () you don't tell anyone else about it.

A. only if
B. if only
C. even if
D. if not

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