___you___out the problem ,sam?not ,yet but I'm going toa.did,work b.are,working c.have,worked d.will work

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___you___out the problem ,sam?not ,yet but I'm going toa.did,work b.are,working c.have,worked d.will work
___you___out the problem ,sam?
not ,yet but I'm going to
a.did,work b.are,working c.have,worked d.will work

___you___out the problem ,sam?not ,yet but I'm going toa.did,work b.are,working c.have,worked d.will work
have you worked out the problem ,sam?
not ,yet but I'm going to
a.did,work b.are,working c.have,worked d.will work
我是从事英语 的,不明可问.

用完成时态 C
你有没有做出这道题,Sam?

c

c