The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.
#94685
A
studying
B
studied
C
to study
D
to be studied
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He sat back on the chair, took a book and began to read, ___.
#98636
A
being looked at ease
B
looked rather at ease
C
to look rather at ease
D
looking rather at ease
_____ many times, but he still couldn't understand it.
#98333
A
Having been told
B
Though he had been told
C
He had been told
D
Having told