The operation room in every hospital has to ______ bacteria of any kind.
#68453
A
keep free from
B
make it free from
C
be made free from
D
be kept free from
推荐题目
 It didn't take the children long to _______ the correct answer.
#68467
A
make out
B
figure out
C
put out
D
take out
How happy you are to _______ good health and a lovely daughter! 
#73009
A
be bored with
B
be based on
C
be blessed with
D
take advantage of
________, he came to know how great his mother was.
#64050
A
From then on
B
From now on
C
Since then
D
Ever since
Not knowing what to do next, the girl _____ her parents for advice. 
#69305
A
turned to
B
set up
C
escaped from
D
blew up