摘要：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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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 |