Welcome to the Ice Bucket Challenge. The challenge is simple: when , one either pours a bucket of icy water over his or her head or donates $100 to the ALS Association.

A. to challenge B. challenged

C. you challenged D. having challenged

B

【解析】

試題分析：考查省略句的用法。如果主句的主語和從句的主語一致，并且謂語動詞是系動詞的情況下，從句就可以把主語和系動詞都省略。所以全句應(yīng)該為：When (someone is）challenged。本題意為：歡迎參加冰桶挑戰(zhàn)。挑戰(zhàn)很簡單：一旦一個人參加了挑戰(zhàn)，這個人要么就要往他或她的頭上潑一桶冰水，要么向肌萎縮側(cè)索硬化癥協(xié)會捐贈100美元。故這道題應(yīng)該選B項。

考點(diǎn)：考查省略句的用法。

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