The robot needs _______ once a month. And we will check it for you for free.
#48844
A
to check
B
checked
C
checking
D
to checking
推荐题目
—What do you think about the idea?—I am really against _________ a running race in the street.
#48956
A
to have
B
having
C
to having
D
have
We’re going to practice_____ English as much as possible.
#50820
A
speak
B
to speak
C
speaking
D
speak about
It’s important ______ us ________ some good books.
#50933
A
for, read
B
to, to read
C
to, reading
D
for, to read