题目内容
(请给出正确答案)
[主观题]
Dense fog comes with bad visibility, fog signal bell must be kept ________at regulation in
tervals
A.to go
B.going
C.goes
D.go
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A.to go
B.going
C.goes
D.go
第2题
A.Be
B.Please to be
C.To be
D.Be for
第4题
A.be discharged
B.discharged
C.discharge
D.being discharged
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