If you feel tired out and unable to thin
题型:选择题
问题:
If you feel tired out and unable to think clearly,that is________you have to get a rest.[ ]
A. why
B. when
C. whether
D. what
If you feel tired out and unable to think clearly,that is________you have to get a rest.[ ]
A. why
B. when
C. whether
D. what