The disease __________ in Africa
A. originate
B. originated
C. originating
D. originator
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I suppose no one has any idea who _________ the story?
A. originate
B. originator
C. originated
D. originating
It was always _________ lamb and canned peas for Sunday lunch.
A. roast
B. roasted
C. roasts
D. roasting
I personally would rather _________ a chicken whole.
A. roast
B. roasts
C. to roast
D. to be roasted
风力同步发电机组的并网条件
A. 波形相同
B. 幅值相同
C. 频率相同
D. 相序相同
E. 相位相同
F. 电流相同
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