Is there any doubt ________ he is a thief?

Is there any doubt ________ he is a thief?

A.about

B.of

C.that

D.with

答案及解析： C

解析：

此句的空白后是一同位语从句，修饰先行间doubt。连词that引导同位语从句，但不在从句中充当成份。