皮皮学，免费搜题
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【单选题】
—What are you going to do? —I will buy a book________. [ ]A.
to my sister
B.
for my sister
C.
of my sister
D.
at my sister
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】We’ll keep producing bikes as long as they remain in demand . = As long as people _____________ we'll keep ____________.
【简答题】We'll keep producing bikes as long as they remain in demand. (turn out)
【简答题】We'll keep producing bikes as long as they remain in demand. (turn out) As long as people keep buying bikes we'll keep __________.