So carefully ____ the performance that i_爱下问搜题

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问题选择题

So carefully ____ the performance that it went smoothly in the competition.

A. have we prepared
B. had we prepared
C. we have prepared
D. we had prepared

答案

答案：B

单项选择题 B1型题

表示肿瘤为恶性的是（）。

A./0

B./1

C./2

D./3

E./6

判断题

做二硫化碳对活性炭吸附的苯系物的解吸效率测试时，化合物的最后浓度应接近曲线的中间浓度。