533.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
534.The hotel wasn't particularly good,but I ______ in many worse hotels.
A.was staying
B.stayed
C.would stay
D.had stayed
533.答案是C;根据句意得知此处强调道将来某个时间已经完成的动作。
534.答案是D;根据上文的时态暗示，stay应发生在此前，故用过去完成时。
