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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It is natural that one's attitude（）his family changes as he grows older.

A. for
B. at
C. of
D. towards
单项选择题
Very little（）they had made an important discovery in science.

A. they realized
B. they realized what
C. did they realize
D. did they realize what
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