By the time he realizes he       into a trap, it’ll be too late for him to do anything about it.
#103233
A
walks
B
walked
C
has walked
D
had walked
推荐题目
If it was fresh and ________, then the ship was close to land.
#103256
A
smelling strong
B
smelled strongly
C
smelled strong
D
smelling strongly
Good heavens! There you are! We___anxious about you, and we ___you back throughout the night. 
#104668
A
are; expect
B
were; had expected
C
have been; were expecting
D
are; were expecting
 We are sure everything here____ by the time you come back from abroad in a few years.
#103694
A
had changed
B
will have changed
C
had been changed
D
will have been changed