Question

【题目】An increasing number of learners are buying online courses in the belief ________ they are much convenient and cheaper.

A. which B. if

C. whether D. that

Answer 1

【答案】D

【解析】考查同位语从句。that引导的同位语从句是对前面的抽象名词进行解释说明。此句中横线后的句子便是对前面抽象名词belief的解释说明也不缺成分。故选D。