______ Mary had heard that sound was she really frightened.

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问题 ______ Mary had heard that sound was she really frightened.

选项 A、Not when
B、Not as
C、Not until
D、Until

答案C

解析本题测试的是引导时间状语从句的连接词。全句的意思是：“直到玛丽听到那声响她才真正地被吓坏了。”not until意为“直到……才”。not when和until根本不存在。until一般不放在句首。根据句意，应选答案C。

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大学英语三级A级

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