——Where did you put the car keys?——Oh, I __________ I put them on the chair because the phone rang as I __________in．
A. remembered； come
B. remembered；was coming
C. remember ； come
D. remember； was coming
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Professor Wang，__________ for his informative lectures，was warmly received by his students．
A. Knowing
B. Known
C. to be known
D. having known
——The thread of kite broke and it flew away．——I told you it would easily break __________it was the weakest．
A. when
B. for
C. since
D. where
顺式作用因子（cis-action factor）
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