As _______ unemployment is very high at the moment, it’s very difficult for people to find _______ work.
#4838
A
the, 不填
B
不填,不填
C
the, a
D
an, the
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—Sorry, do you mind if I smoke here? —Yes,            
#4877
A
you could
B
go ahead
C
I do
D
my pleasure
 No sooner ______ on board the train than it______ to move.
#4621
A
did he go; had started
B
he went; started
C
had he gone; started
D
he had gone; had started