【题目】 Middle school students should be given enough sleeping time, __________they are busy preparing for all kinds of exams.
A. even so B. as though C. as if D. even if
在线课程【答案】D
【解析】
试题分析：考察连词辨析。A.虽然如此；B.仿佛，好像；C.犹如，好像；D.即使，虽然；句意：中学生应当给予充足的睡眠时间，即使他们要忙着准备各种各样的考试。故选D。