单项选择题

How many more decades will have to pass ______ scientists succeed in providing a cure for cancer

A．when
B．before
C．since
D．until
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单项选择题
He thinks he will do it himself () asking his parents for help.

A. rather than
B. other than
C. instead of
D. in place of
单项选择题
She found herself () forward more and more eagerly to the holiday at home.

A. looking
B. bringing
C. desiring
D. expecting
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