If no one ______ the phone, they must have gone out for breakfast.

admin2009-05-15  25

问题 If no one ______ the phone, they must have gone out for breakfast.

选项 A、answer
B、answered
C、had answered
D、has answered

答案B

解析 由if引导的虚拟条件句表示假设,动词用过去时。故本题答案为B。
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