It isn’t cold enough for there______a frost tonight, so I can leave Jim’s car out quite safely.

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问题 It isn’t cold enough for there______a frost tonight, so I can leave Jim’s car out quite safely.

选项 A、would be
B、to be
C、was
D、being

答案B

解析 for引导带逻辑主语的不定式for sb to do sth,本句中的there作形式主语,不定式就是to be a frost。如:“该吃药了”应说:It’s time to take the medicine.如果要说“他在等到该吃药的时间再吃药”就应说:He’s waiting for it to he time to take the medicine.
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