Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.
A. dubiously
B. virtually
C. queerly
D. randomly
参考答案:B
解析: B选项“virtually几乎,事实上,实际上”符合题意,如:The city was virtually paralyzed by the transit strike.(这个城市实际上已陷于交通运输罢工的瘫痪状态)。其他三项“A选项dubiously怀疑地;C选项queerly奇怪地;D选项randomly随机地,无目的地”都不正确,这三个词在语义上都无法与certain搭配。本题空格处是说几乎确信无疑。因此B选项为正确答案。