1、There are five pairs ____,but I'm at a loss which to buy.A.to be choosen B.to choose fromC.to choose D.for choosing2.The horses ought _____ hours ago by raisers.A.to have been fed B.to feedC.to be fed D.to have fed第一题我错选A,第二题错

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1、There are five pairs ____,but I'm at a loss which to buy.A.to be choosen B.to choose fromC.to choose D.for choosing2.The horses ought _____ hours ago by raisers.A.to have been fed B.to feedC.to be fed D.to have fed第一题我错选A,第二题错

1、There are five pairs ____,but I'm at a loss which to buy.A.to be choosen B.to choose fromC.to choose D.for choosing2.The horses ought _____ hours ago by raisers.A.to have been fed B.to feedC.to be fed D.to have fed第一题我错选A,第二题错
1、There are five pairs ____,but I'm at a loss which to buy.
A.to be choosen B.to choose from
C.to choose D.for choosing
2.The horses ought _____ hours ago by raisers.
A.to have been fed B.to feed
C.to be fed D.to have fed
第一题我错选A,第二题错选C
我知道第一题选B，第二题选A，

1、There are five pairs ____,but I'm at a loss which to buy.A.to be choosen B.to choose fromC.to choose D.for choosing2.The horses ought _____ hours ago by raisers.A.to have been fed B.to feedC.to be fed D.to have fed第一题我错选A,第二题错
b从五双当中选
a 本来应该被喂过了

B to do表用来，将要做某事的意思（对应的done表已做完某事）
A ought to do 固定词组，表应该，=should
“本来应该被”,用完成时态。
这就是解释啊！
要再详细，发信息给我吧！

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