摘要： People begin to know that most environmental problems exist because necessary measures for preventing them taken in the past. A. are not B. were not C. hadn't been D. wouldn't be
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People begin to know that most environmental problems exist because necessary measures for preventing them _______taken in the past.
A. are not B. were not C. hadn't been D. wouldn't be
查看习题详情和答案>>People begin to know that most environmental problems exist because necessary measures for preventing
them _____ taken in the past.
them _____ taken in the past.
[ ]
A. are not
B. were not
C. hadn't been
D. wouldn't be
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B. were not
C. hadn't been
D. wouldn't be
4. People begin to know that most environmental problems exist because necessary measures for preventing them _______taken in the past.
A. are not B. were not C. hadn't been D. wouldn't be
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4. People begin to know that most environmental problems exist because necessary measures for preventing them _______taken in the past.
| A．are not | B．were not | C．hadn't been | D．wouldn't be |