The 30th London Olympic Games ____________ on July 27th, 2012.
#44703
A
will be held
B
is held
C
was held    
D
has been held
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Thanks to the Internet, different kinds of information        in a short time.
#44436
A
can be learned
B
has been learned
C
can learn
D
has learned
---Where’s your mother?   ---Oh, she ______ Shanghai on business. 
#44748
A
have been to
B
have gone to
C
has been to
D
has gone to
I think students______ to do homework with friends.
#44694
A
is allowed
B
are allowed
C
should allowed
D
should be allowed