1.猫吃耗子是因为耗子中含有猫自身所不能合成的（）
A. 对乙酰氨基酚
B. 氨基酸
C. 枸橼酸
D. 牛磺酸
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She lived there before he ____ to China.
A. came
B. comes
C. come
D. coming
I____ my homework at 7:00 yesterday evening.
A. finished
B. would finish
C. was finishing
D. finish
The last time I __ Jane she ___ cotton in the fields.
A. had seen, was picking
B. saw, picked
C. had seen, picked
D. saw, was picking
I don ' t think Jim saw me; he ___ into space.
A. just staring
B. wasjust staring
C. has just stared
D. had just stared
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