The book was so difficult that he read it for three hours___
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The book was so difficult that he read it for three hours______he understood it.
A.when
B.until
C.after
D.before
请问为什么选until详细说明下.还有为什么不是that he has read it for three hours
for应该是用完成时啊?
A.when
B.until
C.after
D.before
请问为什么选until详细说明下.还有为什么不是that he has read it for three hours
for应该是用完成时啊?
这句话表示过去的事实.(与现在没有任何联系,不能用现在完成时)
意思是:这本书很难,他读了三遍直到读懂.
read 是过去式与understood 时态一致
意思是:这本书很难,他读了三遍直到读懂.
read 是过去式与understood 时态一致
The book was so difficult that he read it for three hours___
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