Difficult _____ in practice, this new technique hasn’t been applied.
#91010
A
operated
B
to be operated
C
operating
D
to operate
推荐题目
______ cold, he covered his blanket, ______ only his arms ______.
#91491
A
Felt, left, uncovered
B
Feeling, left, uncovered
C
Feeling, leaving, uncovered
D
Felt, left, uncovering
 Your idea surprised me, it is a(n) _____. 
#98280
A
idea surprised
B
surprised idea
C
surprising idea
D
idea surprising
---Who broke the door?----Marry did. He admitted___it.
#97837
A
to break
B
to have broken
C
breaking
D
to be broken