Last month, the Japanese government expressed their thanks for the aid they ___ from China.
#63811
A
receive
B
are receiving
C
have received
D
had received
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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
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