The research they had been devoted to ______ to be of great value to the cancer patients.
A．is provedB．provesC．has provedD．proved
D
考查時態(tài)。句意：他們一直從事的研究證明對治療癌癥病人有巨大價值。they had been devoted to為后置定語從句。結(jié)合語境可知本句描述的是過去發(fā)生的動作，故用過去時態(tài)。選D。
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