The maths problem is so difficult that none of them can          .
#57894
A
work out it
B
work it out
C
find out it
D
find it out
推荐题目
I won’t go to the concert because I________ my ticket.
#55143
A
lost
B
don’t lose
C
have lost
D
will lost
She________ Ken Green. Her last name ________ Green. 
#57179
A
am,am
B
is,is
C
is,am
D
am, is
 – Tony, do you know Mike’s phone number? -- No, but I can _____ in my phone book.
#59284
A
look it up
B
look it out
C
look for it
D
look up it