If the North Sea______in winter, you could walk from London to Oslo.

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问题 If the North Sea______in winter, you could walk from London to Oslo.

选项 A、happened to freeze
B、froze
C、should freeze
D、should happen to freeze

答案B

解析 本题考查虚拟语气。根据主句中的谓语动词could walk可知,if引导的是非真实条件句,与一般现在时相反,从句的谓语动词应用过去式,故答案为[B]。
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