问题补充：
about the result of the experiment，he still wants to give it a try．
A. Uncertain as he is
B. As uncertain he is
C. As he is uncertain
D. Uncertain is he as
答案：
(答案→)A. Uncertain as he is
B. As uncertain he is
C. As he is uncertain
D. Uncertain is he as
解析：句意：虽然他对实验的结果不是太确定，他还是想试一试。As可以用于倒装句，表示“虽然”，结构是：形容词/副词/动词/(不加冠词的)名词+as/though+主谓，符合这个结构的是A项。
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