单项选择题

To succeed in a scien:tific experiment, ______.

A．one needs being patient person
B．patience is to need
C．one needs to be patient
D．patience is what needed
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单项选择题
It is because he is kind and modest______he wins the respect of others.
A．what
B．which
C．why
D．that
单项选择题
She______be ill because I saw her playing tennis just now.
A．can't
B．couldn't
C．mustn't
D．may not
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