问题
选择题
A collection of photographs _________in the museum were all taken twenty years ago. [ ]
A. on the display
B. is on the display
C. on display
D. is on display
答案
答案：C
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A collection of photographs _________in the museum were all taken twenty years ago. [ ]
A. on the display
B. is on the display
C. on display
D. is on display
答案：C