If you feel tired and sick of fat food,
题型:选择题
问题:
If you feel tired and sick of fat food, that is ______ you have to go to the hospital for medical examination.
A.why
B.whether
C.when
D.what
If you feel tired and sick of fat food, that is ______ you have to go to the hospital for medical examination.
A.why
B.whether
C.when
D.what