The children ______ a P.E. class on the playground when it began to rain suddenly.
#53836
A
have
B
are having
C
had
D
were having
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It _______ seven years __________ Hong Kong returned to China.
#60856
A
was, since
B
is, since
C
was, after
D
is , after
—To protect animals in danger ,we should      people    them .—I agree with you. 
#57445
A
ask, to kill
B
to stop , to kill
C
stop , saving
D
stop , killing
It’s hard to keep the house       with three kids.
#61626
A
cleaning
B
to clean
C
cleaned
D
clean