There is no doubt he will finish the task in time.A. whileB. whyC. ifD. that

问题补充：

There is no doubt he will finish the task in time.

A. while

B. why

C. if

D. that

答案：

A. while

B. why

C. if

(答案→)D. that

解析：考查同位语从句。同位语从句that he will finish the task in time解释doubt的内容。结合句意可知D正确。句意：毫无疑问他将及时完成任务。