Mary is the only one of the students in our class who ____ to the Great Wall so far.
#103115
A
is
B
has been
C
are
D
had been
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It is demanded that you ____ at six. 
#102746
A
will arrive
B
arrive
C
arrived
D
would arrive
— Why? Tom, your shirt is so dirty! — Mum, I __ my storeroom downstairs。
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A
cleaned
B
have worked
C
was cleaning
D
have been cleaning
—Why do you want to work for our company?—This is the job that I ______for.
#102407
A
looked
B
am to look
C
had looked
D
have been looking