By the time we reach that page, we ___________ twenty lessons of the book.
A．will studyB．will have studiedC．would studyD．have studied
B
這題考查時(shí)態(tài)，時(shí)間是：By the time+時(shí)間狀語從句，“到…時(shí)間為止”，主句用相應(yīng)的過去時(shí)，因?yàn)闀r(shí)間狀語從句用的是一般現(xiàn)在時(shí)代替將來時(shí)，所以主句用將來完成時(shí)。句意是：到我們學(xué)到那一頁為止，我們將已經(jīng)學(xué)了20課了。選B。
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