题目内容
The importance of protecting the environment seemed ________ until many families lost their homes because of dust and draught.
- A.not to have realized
- B.to have not realized
- C.not be realized
- D.not to have been realized
D
not应在to的前面。须用不定式的被动完成形式。
not应在to的前面。须用不定式的被动完成形式。
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