—He has been working________.
—No wonder he looks very tired now. [ ]
A. sooner or later
B. day and night
C. now and then
D. here and there
答案:B
—He has been working________.
—No wonder he looks very tired now. [ ]
A. sooner or later
B. day and night
C. now and then
D. here and there
答案:B