问题补充：
I have the same opinion as yours we should carry out the experiment at once.
A. that
B. which
C. whether
D. where
答案：
(答案→)A. that
B. which
C. whether
D. where
解析：考查同位语从句。 we should carry out the experiment at once.
是opinion 的同位语从句，且句意完整，所以选A。
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