Tibetan antelopes are in danger now .Only hundreds of them ___today.Protecting them is important.A remain C keep 我知道是选A,B为什么不对,

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Tibetanantelopesareindangernow.Onlyhundredsofthem___today.Protectingthemisimportant.AremainCkeep我知道是

Tibetan antelopes are in danger now .Only hundreds of them ___today.Protecting them is important.A remain C keep 我知道是选A,B为什么不对,
Tibetan antelopes are in danger now .Only hundreds of them ___today.Protecting them is important.
A remain C keep 我知道是选A,B为什么不对,

Tibetan antelopes are in danger now .Only hundreds of them ___today.Protecting them is important.A remain C keep 我知道是选A,B为什么不对,
KEEP是主动词,且是及物动词,REMAIN有剩下,留下的意思,不是为谁主动KEEP(留下)而是残留REMAIN(被动的剩下)所以用A

remain留存,是主动的。
keep应该是被保留下来。
要用被动are kept