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
问题描述：
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
答