问题
选择题
Almost all of his time ______ experiments, he has no time to visit his parents.
A．devoted to do
B．devoted to doing
C．devoting to doing
D．is devoted to doing
答案
答案：B
devoted to后接名词或者动名词,致力于……过去分词做他的时间和devote有动宾关系，故用被动语态，此处省略be动词，故选B。