21、Penn hopes Mr. White will be successful in reducing class sizes. _____, she would worry.

A．If no               B．If it is not                C．If not                     D．If it is no

21、C

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Penn hopes Mr. White will be successful in reducing class sizes. _____, she would worry.

A．If no               B．If it is not                C．If not                     D．If it is no

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