Senior 3 high school students should be given enough sleeping time they are busy prepari

问题补充：

Senior 3 high school students should be given enough sleeping time, they are busy preparing for exams to enter college.

A. even so

B. as though

C. as if

D. even if

答案：

A. even so

B. as though

C. as if

(答案→)D. even if

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