—Where have you been recently?    —I ________ in Hangzhou on business for a week last month.
#104528
A
have been
B
was
C
had been
D
had gone
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—Why? Where is the key to the meeting room? —Dear me! You ______ it in the taxi!
#104446
A
had never left
B
didn’t leave
C
never left
D
haven’t left
 Great changes ______ in the past few years, and a lot of factories ________.
#100648
A
had taken place; have been set up
B
have taken place; have been set up
C
took place; have set up
D
were taken place; were set up