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

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

admin2009-05-15  55
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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