The elders are always ______ in China.
A. being taken care
B. taken care
C. being taken care of
D. taking care of
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Experiments in the photography of moving objects______in both the United States and Europe
A. were conducting
B. have been conducting
C. had been conducted
D. had conducted
You didn't know what the teacher said in the classroom? You ______ asleep.
A. must be
B. must have been
C. should be
D. should have been
You have to read the manual carefully first, otherwise you______have difficulty using the
A. should
B. will
C. might
D. may
The passage tells us how to______.
A. make a sales presentation
B. make friends with a prospect
C. present ourselves to a prospect
D. make an appointment with a prospect