China began to open to the outside world in the late 1970s. _________, there have been great changes in the country.                  
#46264
A
By then
B
As a result
C
At last
D
In all
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We didn't know the good news _________he told us.
#49767
A
after
B
or
C
because
D
until
He ____ his homework ____ Sunday.
#47859
A
doesn’t , on
B
don’t do, in
C
doesn’t do, on
D
don’t do, on