问题
选择题
By the time he realizes he________into a trap, it’ll be too late for him to do anything about it. [ ]
A. walks
B. walked
C. has walked
D. had walked
答案
答案：C
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By the time he realizes he________into a trap, it’ll be too late for him to do anything about it. [ ]
A. walks
B. walked
C. has walked
D. had walked
答案：C