问题
选择题
Many people believe that ______ will take years to develop a car that does not pollute the air. [ ]
A. it
B. that
C. there
D. this
答案
答案：A
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Many people believe that ______ will take years to develop a car that does not pollute the air. [ ]
A. it
B. that
C. there
D. this
答案：A