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

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

1. A.
   even so
2. B.
   as though
3. C.
   as if
4. D.
   even if

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

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

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