The current ______steady and strong, for the boat kept moving forward smoothly.A

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问题 The current ______steady and strong, for the boat kept moving forward smoothly.

选项 A、can’t have been
B、needn’t have been
C、must have been
D、should have been

答案 C

解析水流肯定是平稳而有力的，因为这只小船一直在顺利地向前行进。本题考查情态动词表达推测的用法，四个选项只有must have done表示对过去事实的肯定推测。

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