If you _______ someone, you invite them to flight or compete with you in some way.

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B 【解析】句意：如果你挑戰(zhàn)某人，你會邀請他們?nèi)?zhàn)斗或者和他們在某方面競爭。A. encourage鼓勵；B. challenge挑戰(zhàn)；C. introduce介紹。根據(jù)句意：你邀請他們?nèi)?zhàn)斗或者和他們在某方面競爭，可知是“如果你挑戰(zhàn)某人”，“挑戰(zhàn)”challenge。分析題干可知這是if引導(dǎo)的條件狀語從句，要遵循“主將從現(xiàn)”的原則，所以if從句要用一般現(xiàn)在時，故答案選B。
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