Almost all of his time ______ experiments, he has no time to visit his parents.
A．devoted to doB．devoted to doing
C．devoting to doingD．is devoted to doing
B
devoted to后接名詞或者動(dòng)名詞,致力于……過去分詞做他的時(shí)間和devote有動(dòng)賓關(guān)系，故用被動(dòng)語態(tài)，此處省略be動(dòng)詞，故選B。
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