There is no doubt ________ Tom is a good clever boy.
A．whetherB．ifC．whenD．that
D
考查doubt固定用法。當(dāng)?shù)絛oubt前為肯定形式時，后接if或者whether從句；當(dāng)doubt前為否定形式時，后接that從句。No表達否定含義，故選D。
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