---Look at these tracks. It _____ be a wolf.”
---Don’t be so sure. I think it _____ be a fox.
A.must; couldB.may; mightC.need; mustD.could; need
A
考查情態(tài)動詞。Must可表示肯定推測,意為“一定”;could“可能”,表示的可能性沒有can大,但比may大。句意“看那些腳印。它一定是一匹狼!薄安灰敲纯隙。我認(rèn)為是一只狐貍。”故選A。
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