Lady Gaga has put off her concerts becau
题型:选择题
问题:
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
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