填空题

Faxes may be the most(frequent) ______ used form of communication among them.

【参考答案】

frequently。
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A．In a bookshop.B．In a library.C．In a laboratory.D．In a classroom.
A．In a bookshop.
B．In a library.
C．In a laboratory.
D．In a classroom.
填空题
The (apply) ______ letter was a good one except for a few spelling mistakes.
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