14．Please do me a favor-Call Dr．Smith and      him to join us for the picnic tomorrow．（　　）
A．to inviteB．invitingC．inviteD．invited

分析 請幫忙給Dr．Smith打個(gè)電話，邀請他明天跟我們一起去野餐．

解答 答案C
這是一個(gè)以動詞原形開頭的祈使句，and連接前后兩個(gè)并列成分，形式要保持一致，前面用動詞原形do，所以后面也要用動詞原形invite．

點(diǎn)評 本題考查祈使句；這是一個(gè)表示請求的祈使句，結(jié)構(gòu)是以動詞原形開頭．

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