why do some of whales have to_?because their number is getting smaller and smaller.why do some of whales have to_?because their number is getting smaller and smaller.a.protect b.protected c.be protected d.be protect

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whydosomeofwhaleshaveto_?becausetheirnumberisgettingsmallerandsmaller.whydosomeofwhaleshaveto_?becau

why do some of whales have to_?because their number is getting smaller and smaller.why do some of whales have to_?because their number is getting smaller and smaller.a.protect b.protected c.be protected d.be protect
why do some of whales have to_?because their number is getting smaller and smaller.
why do some of whales have to_?
because their number is getting smaller and smaller.
a.protect b.protected c.be protected d.be protect

why do some of whales have to_?because their number is getting smaller and smaller.why do some of whales have to_?because their number is getting smaller and smaller.a.protect b.protected c.be protected d.be protect
c.be protected.
为什么鲸鱼要被保护?被动,be protected

选择D be protecyed被动句“被保护”