问题
选择题
We saw that the building _______ fire last night and is still _______ fire now. [ ]
A. caught; caught
B. caught; on
C. on; on
D. on; caught
答案
答案：B
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We saw that the building _______ fire last night and is still _______ fire now. [ ]
A. caught; caught
B. caught; on
C. on; on
D. on; caught
答案：B