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【题目】It's nearly 7 o'clock. Jack ____________ be here at any moment.
A.shall
B.had to
C.ought to
D.have to

【答案】C
【解析】句意:现在已经七点钟了。杰克应该会随时出现的。ought to"应当",表示推测和可能性;shall常用于主语是第一人称的句子中,如果主语是第二、三人称,则表示"责备,警告"等;have to"必须",强调客观需要。故选C。

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