High school students should be given enough sleeping time they are busy with their stud

问题补充：

High school students should be given enough sleeping time , they are busy with their study .

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

解析：本题考查连词辨析。句意：应该给中学生充分的睡眠, 尽管他们忙于准备各种各样的考试。由句意可知D项正确。