Low-carbon lifestyle is of great benefit to improve the world environment, but the problem is difficult to _________.
#74095
A
solve
B
be solved
C
solve with
D
solving
推荐题目
 Any student _____ will be disqualified from the exam. 
#81935
A
catching cheating
B
catching to cheat
C
caught cheating
D
caught to cheat
 ---John, whose house is that? ---It ______Mr White.
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A
is belonging to
B
is belonged to
C
belongs to
D
belonged to
Have you _____ the book yet?
#81474
A
find
B
discovered
C
invented
D
found