John loves reading,so he often gets lost in ____he is reading and doesn't take a break.A.that B.what C.when D.while

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John loves reading,so he often gets lost in ____he is reading and doesn't take a break.A.that B.what C.when D.while

John loves reading,so he often gets lost in ____he is reading and doesn't take a break.A.that B.what C.when D.while
John loves reading,so he often gets lost in ____
he is reading and doesn't take a break.
A.that B.what C.when D.while

John loves reading,so he often gets lost in ____he is reading and doesn't take a break.A.that B.what C.when D.while
B what在这里引导了一个宾语从句,what在从句中做的是reading的宾语
若用A that,应是lost inthe book that he is reading
CD显然都不对

a
代指

选B。what一方面做reading的宾语,一方面做从句的先行词。宾语从句