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【单选题】
A reason why solar panels may NOT be a good investment is that ____.
A.
they are not efficient
B.
they produce energy
C.
companies are already them
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】At the end of the discussion, the students report back to the class about ____.
A.
their choice of an energy source to invest in
B.
how they invest their own money and energy
C.
which three energy sources they discussed