In some cases, the flu virus ______ an overwhelming and potentially fatal immune response.

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问题 In some cases, the flu virus ______ an overwhelming and potentially fatal immune response.

选项 A、triggers
B、envisages
C、confines
D、irritates

答案A

解析 该句意为:某些情况下,流感病毒引发免疫反应,不仅势不可挡,而且可能是致命的。trigger:诱发,引发,扳机;envisage:想象,设想,预测;confine:限制,局限;irritate:使……恼火,刺激。
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