—You look so tired. What’s the matter?
—I was so busy that I didn’t go to bed 12 o’clock last night.
A.until | B.unless | C.if | D.so |
—You look so tired. What’s the matter?
—I was so busy that I didn’t go to bed 12 o’clock last night.
A.until | B.unless | C.if | D.so |