– “Where is Dung?” – “He is work. He is busy his monthly report. A. on/for B. in/about C. to/through D. at/with
– “Where is Dung?” – “He is ___ work. He is busy ___ his monthly report.
A. on/for
B. in/about
C. to/through
D. at/with
Đáp án: D