My uncle from Hongkong has changed so much that I could hardly ________ him at the airport. 
#63815
A
understand
B
realize
C
recognize
D
know
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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
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