This robot is supposed to save a lot of labor, but it remains a problem if it ______.
#37091
A
is
B
saves
C
does
D
has
推荐题目
---How well do you know the Opera House?--- I know the place very well. I Sydney many times.
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A
have been in
B
have been to
C
have gone to
D
have arrived in
The boys when the teacher came in. So she was very angry．
#36667
A
were doing homework
B
were cleaning the classroom
C
were fighting
D
were learning English
China ______ the WTO for more than 10 years, and it has brought great changes to it.
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A
has joined
B
has been in
C
has become a member of
D
has joined in
--Have you finished your work yet? --Yes, I have . It ____________ half an hour ago.
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A
has been finished
B
finished
C
was finished
D
has finished