—Itisreportedthatthereisbigbre

—It is reported that there is big breakthrough in the cancer treatment.
—If only his son could be brought back to life!

A．a ; 不填

B．不填 ; a

C．the ; the

D．a ; the

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A．talked	B．have talked
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A．will teach	B．would have taught
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A．was working	B．had worked
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