A telephone user may pay a fixed monthly charge and (allow) ______ to make an unlimited number of local calls in the month.

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问题 A telephone user may pay a fixed monthly charge and (allow) ______ to make an unlimited number of local calls in the month.

选项

答案be allowed/is allowed

解析 本题考查的是被动语态。allow为谓语,主语是a telephone user,为被动的关系,所以用be allowed或者是is allowed。
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