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
答案:D
解析:
解析:
|
not应在to的前面。须用不定式的被动完成形式。 |
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