问题：
—Mr. Gao went to Shanghai for the art exhibition last week.
—Is that why he had two days _____?
[ ]
A. away
B. on
C. of
D. off
—Mr. Gao went to Shanghai for the art exhibition last week.
—Is that why he had two days _____?
B. on
C. of
D. off
—Is that why he had two days _____?
[ ]
A. away B. on
C. of
D. off
参考答案：