[問題]2004年5月文法Q28

[mitori]

28.Platelets are tiny blood cells that help (transport) hormones and other chemicals (throughout) the body, and (it) play a (key role) in clotting blood.

請問B為什麼對呢
那D是要改成they嗎?

[茱莉]

不是they
應該只要role就可以了吧

[mitori]

我發現我寫錯了...答案是C才對...請問C是要改成they 嗎?

[molecular]

對!! platelets 是複數