—Can you tell me if Tom has finished his homework?—I've no idea. He ________ it this morning.
#63699
A
has being doing
B
had done
C
is doing
D
was doing
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Tom said he           to Guangzhou.
#40149
A
never went
B
had never been
C
has never gone
D
has never been
Don’t make a noise! They _______on a physics problem now.
#41516
A
will work
B
are working
C
worked
D
have worked