Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.
#63798
A
would lock
B
was locking
C
has locked
D
had locked
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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
 The plan ______ just because people were unwilling to co-operate.
#63826
A
broke down
B
pulled down
C
turned down
D
put down
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