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

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1. (2018高一下·哈尔滨月考) 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

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备考2019年高考英语一轮复习26：同位语从句