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