though he was ill,[ ] he went to school.A;/B;untilC;butD;so必须有理由

问题描述:

though he was ill,[ ] he went to school.
A;/
B;until
C;but
D;so
必须有理由

选A.
中文是尽管他病了,但是他还是去上学了.
在英文里though与but不能同时出现,所以选A.