【題目】Meyer and his team were the first ______ how the disease spreads from animals to humans.
A.showing
B.show
C.to show
D.shown

【答案】C
【解析】本題考查非謂語動詞，非謂語動詞作定語前有the only, thelast, the next,the first, the best 等序數(shù)詞或形容詞最高級時，必須用不定式。

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