When the American constitution ______into effect in 1789,it didn’t contain any words guaranteeing the basic rights of ordinary citizens.
#104983
A
went
B
had gone
C
has gone
D
was going
推荐题目
By the time these books were published,  he _____ addicted to them.
#102731
A
had become
B
becomes
C
has become
D
became
They made up their mind that they______ a new house once Larry changed jobs. 
#99080
A
bought
B
would buy
C
have bought
D
had bought
The computer was invented in the 1940’s and ______ quite a lot ever since.
#100726
A
was changed
B
had changed
C
has been changed
D
will change
He________Beijing,so he knows a lot about it.
#99171
A
has gone to
B
has been to
C
went to
D
goes to