The two friends _____ on the Internet for three hours, and they would go on till the next morning. 
#63829
A
had been chatting
B
had chatted
C
were chatting
D
has been chatting
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What I wanted to know was when and where the meeting ______.
#63812
A
was holding
B
had held
C
was to hold
D
was to be held
They__________on the program for almost one week before I joined them, and now we ________on it as no good results have come out so far.
#63797
A
had been working; are still working
B
had worked; were still working
C
have been working; have worked
D
have worked; are still working
Their house _____ in the big fire, so they decided to build another one.
#63799
A
has been destroyed.
B
had destroyed
C
had been destroyed
D
destroyed