Scientists are ______ certain that there is a cancer-inhibiting agent in the blo

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问题 Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.

选项 A、dubiously
B、virtually
C、queerly
D、randomly

答案 B

解析 dubiously怀疑地；queerly奇怪地；randomly随机地，无目的地；这三个词在语义上都无法与certain搭配。virtually几乎，事实上，实际上，在此修饰certain，意思是“几乎确信无疑”。

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