[多益]改錯題

[miiitiiiGG (靖)]

Staff members must display proper identification when
      A                                B
requested to do by any member of our security force
       C
while on company premises.
  D

答案是C 應改為"when requested to do so"
我想問說
為什麼要加so當受詞?
前面不就有寫了事件了嗎?
我本來以為是要改成"when they requested to do"

另外順便問一下
rise 跟 raise 要怎麼分呀?

先謝謝指點了~!!

--
※ 編輯: miiitiiiGG      來自: 220.131.97.63        (12/03 23:24)
推 ilovejai:rise~"to move to a higher position"而且不需要受詞
→ ilovejai:例如 The curtain rose and the play began
→ ilovejai:Raise~"to move someone or something to a higher posi"
→ ilovejai:通常要有受詞 ex they raised the curtain and the play
→ ilovejai:began.
推 gravitino:答案C可不可以去掉"to do" 只用"when requested by..."?
推 djnospam:Yes.