问题
选择题
We were all at a loss, ________ what was behind this sudden change of the plan.[ ]
A. to wonder
B. wondered
C. wondering
D. wonder
答案
答案:C
We were all at a loss, ________ what was behind this sudden change of the plan.[ ]
A. to wonder
B. wondered
C. wondering
D. wonder
答案:C