—The box is too heavy to carry. What's in it?      —Oh, it is ________ books.
#52300
A
filled with
B
covered with
C
used for
D
asked for D
推荐题目
 I usually use my computer _________my emails and buy tickets.
#56132
A
check
B
chceks
C
to check
D
checking
.Not only her mother but slao her father_____in the same school for twenty years.
#53705
A
will teach
B
has taught
C
have taught
D
are teaching
They  here on foot yesterday. 
#59690
A
arrived at
B
reach
C
got to
D
arrived