单项选择题

Jerry seldom came to the laboratory,（）he

A、 did he
B、 didn't he
C、 does him
D、 doesn't he

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单项选择题
Not only did Franz know her,（）he was also her classmate.

A、 and
B、 also
C、 but
D、 or
单项选择题
Courage, intelligence, and experience all（）to overcome obstacles.

A、 helps
B、 helping
C、 help
D、 helped
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