We thought there were 35 students in the dining hall, ________, in fact, there were 40.
A.whileB.whetherC.whatD.which在线课程A
解析：
句意：我们原以为在餐厅里只有35名学生，然而实际上却有40人。此题主要考查while的另一用法：while表示对比或转折，相当于but，但是语气没有but重。其中in fact是关键词。