we find the exercise difficult_______ without the teacher’s help. A. to be done B. to do it C. to do D.of doing
A.A
B.B
C.C
D.D
正确答案是C
we find the exercise difficult_______ without the teacher’s help. A. to be done B. to do it C. to do D.of doing
A.A
B.B
C.C
D.D
正确答案是C