题目内容

--- I knocked at the door and nobody answered.

--- They　　 have been out for a picnic.

A. should 　　　　　　 B. could　　　　　　　　

C. need　　　　　　　　 D. must

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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