—I have been waiting for you so long. —Sorry, I have been in the library, _______ my friend look for some books.
#94750
A
helped
B
helping
C
to help
D
help
推荐题目
O'Neal works hard. He is often seen _______ heavily before his teammates have even arrived at practice.
#98080
A
sweated
B
to be sweated
C
sweating
D
being sweated
This kind of material can be used to _____plastics.
#95998
A
taking the place of
B
take place of
C
taking place of
D
take the place of
---- What do you think of the book ? ---- Oh excellent. It’s worth _________ a second time.
#89593
A
to read
B
to be read
C
reading
D
being read
The room is empty except for a bookshelf _____ in one corner.
#91128
A
standing
B
to stand
C
stands
D
stood