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What a nice picture you have drawn!I _____ know you _____ so

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What a nice picture you have drawn!I _____ know you _____ so well A.didn't,can draw B.do,can't dra
IWhat a nice picture you have drawn!I _____ know you _____ so well
A.didn't,can draw
B.do,can't draw
C.didn't,could draw
D.did,couldn't draw
前空格填did过去式,没疑问.问题后面是填can 还是could?Why?
What a nice picture you have drawn!I _____ know you _____ so
答案是C.其实你可以这么理解,I didn't know (that) you could draw so well,括号里面的that给省略掉了,这其实是一个过去时的从句;你也可以说I don't know (that) you can draw so well.