单项选择题

Nobody knows, ______

A．does nobody
B．does one
C．does he
D．do they

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单项选择题

Then it was Jerry's duty to cautiously ______ the arrow had it missed the mark.

A．recover
B．regain
C．refund
D．retrieve

单项选择题

Mary has a 15-year contract with the company. By June next year, Mary ______ with this company for 14 years.

A．will have been working
B．will have worked
C．will work
D．works

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