1. Henry _______ into the restaurant when the writer was having dinner.
A. was going
B. went
C. has gone
D. did go
Tìm lỗi sai và sửa lỗi
2.Someone was knocking at the door when I was doing the washing up.
Giải giúp mình với lí do chọn đáp án này mà không chọn đáp án khác
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