Great changes ______ in my school in the past ten years.
#100927
A
took place
B
were taken place
C
have taken place
D
have been taken place
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 A high-tech exhibition ________in the National Museum now. Let’s go and visit it.
#100890
A
will be held
B
is being held
C
was held
D
has been held
 Everything he _____ to his country.
#103067
A
had was contributed
B
had been contributed
C
had to be contributed
D
had contributed
—Where is Tom ?—Well , he __________ you __________ here. Otherwise he would come down right now.
#104290
A
didn’t know ; were
B
hasn’t known ; are
C
doesn’t know ; are
D
hadn’t known ; were