There is no doubt Tom is a good clever boy.A. whetherB. ifC. whenD. that

问题补充：

There is no doubt Tom is a good clever boy.

A. whether

B. if

C. when

D. that

答案：

A. whether

B. if

C. when

(答案→)D. that

解析：考查doubt固定用法。当到doubt前为肯定形式时，后接if或者whether从句；当doubt前为否定形式时，后接that从句。No表达否定含义，故选D。