单项选择题

I have repeatedly recommended that our social security system _______cover many of the occupations. ( )

A．being extended
B．extended to
C．had extended to
D．be extended to
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单项选择题
He _______ hurt last year early in the playoffs and never came back. ( )
A．got
B．were
C．be
D．has got
单项选择题
Then you will come to a level plain, in which the Nile ____ round an island named Tachompso. ( )
A．flows
B．flow
C．is flowing
D．flowing
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