Tom was ______ only because he made a mistake.
#50521
A
laugh
B
laughed
C
be laughed
D
laughed at
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As for _____homework, we do ________homework every day.
#49737
A
do , our
B
doing, our
C
does, we
D
doing, us
Dr. Ma used to            two or three persons in the hospital.
#49403
A
operate on
B
operating on
C
operate for
D
operating for