问题
选择题
Lady Gaga has put off her concerts because of the difficulties _____ by the ongoing strikes.[ ]
A. causing
B. to cause
C. to be caused
D. caused
答案
答案：D
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Lady Gaga has put off her concerts because of the difficulties _____ by the ongoing strikes.[ ]
A. causing
B. to cause
C. to be caused
D. caused
答案：D