When the teacher came into the classroom, the students ____ in groups.
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A
work
B
have worked
C
were working
D
are working
推荐题目
I ____ Mr. Smith since he moved to Shanghai.
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A
didn’t hear from
B
don’t hear from
C
won’t hear from
D
haven’t heard from
---How clean the window is ! -----Yes ! It _______ just now .
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A
has been cleaned
B
was cleaned
C
is cleaned
D
will be cleaned
Mary isn’t ________ a book. She is ________ TV.
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A
seeing, seeing
B
watching, looking
C
reading, watching
D
looking at, watching