This medicine _______ before dinner.
A. should be taken
B. should have taken
C. should take
D. took
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Before we reached the top of the hill, we ________ in the rain.
A. had been caught
B. did catch
C. caught
D. catch
The children ________ many times not to go near the lake.
A. have told
B. have been told
C. told
D. tell
The work _______ by the time you get there.
A. was done
B. had been done
C. will have been done
D. is done
不与红细胞的生理性变化有关的是
A. 性别
B. 年龄
C. 精神因素
D. 红细胞寿命缩短
E. 感情冲动
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