问题
单项选择题
（）,we keep records on all the experiments so that we may have enough.
A.As a whole
B.As a rule
C.On the average
D.by all means
答案
参考答案：B
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（）,we keep records on all the experiments so that we may have enough.
A.As a whole
B.As a rule
C.On the average
D.by all means
参考答案：B