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
The country life he was accustomed to________ greatly since 1992. 
#101373
A
has changed
B
change
C
changing
D
have changed
Dr. Smith, together with his wife and daughters,     visit Beijing this summer.
#101088
A
is going to
B
are going to
C
was going to
D
were going to
----Hi, Tracy; how are you doing?-----I’m tired out, for I ______my living room all day.
#102278
A
painted
B
had painted
C
have painted
D
have been painting
Great changes _________ in my hometown in the past 20 years.
#102811
A
took the place
B
have taken place
C
were taken place
D
took place
—Remember how we met for the first time, Dick? —Of course I do.You ______ to the teachers’ office hurriedly and ______ me.
#101601
A
had walked; weren't noticing
B
were walking; didn't notice
C
had been Walking; noticed
D
walked; had noticed