--- What do you think of the math problem ? --- It’s very hard and nobody has _______.
#57830
A
put it out
B
helped it out
C
worked it out
D
solve
推荐题目
Millions of trees         on March 12th last year.
#53285
A
are planted
B
were planted
C
was planted
D
is planted
Let her ________ the book there.
#61697
A
bring
B
brings
C
taking
D
take