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--- I knocked at the door and nobody answered. --- They have been out for a picn

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--- I knocked at the door and nobody answered. --- They have been out for a picn

--- I knocked at the door andnobody answered.

--- They   havebeen out for a picnic.

A. should    B.could   

C. need   D.must

试题答案

答案:A

解析:
我敲了门,但是没人回应。

他们应该是去野炊了。

 

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