单项选择题

I had just started back for the house to change my clothes, ______ I heard voices.

A. as

B. when

C. after

D. while
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单项选择题
The company ______ a rise in salary for ages, but nothing has happened yet.
A. is promised


B. has been promising
C. is promising


D. promised
单项选择题
The neighbors ______ you very much for you to speak in that way about them.
A. must annoy


B. may annoy
C. must have annoyed

D. could have annoyed
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