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A.how much you paid for it

B.how much did you pay for it

C.when you bought it

D.when did you buy it

A.when your brother comes back； when he will come back

B.when your brother will come back； when he comes back

C.when your brother comes back； when he comes back

D.when your brother will come back； when he will come back

A.when you will visit Beijing

B.when you visited Beijing

C.when will you visit Beijing

D.when did you visit Beijing