问题
s the noise It sounds as if it comesfrom upstairs –______ It must be thewindow-cleaner working , nextdoor
A:being knockeddown
B:WorkedC will work Dhave been working
C:to be knockeddown
D:have been working
B:WorkedC will work Dhave been working
C:to be knockeddown
D:have been working
正确答案是：
同类题型
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