13. I know that it will be difficult to pick him out in such a crowd  but if you    happen to see him, give him this packet.

A. would     B. might

C. should   D. could

13.   C考査情態(tài)動詞。"if+主語+ should+動詞原形"是一個真實的條件句，常常用于表達禮貌地請求或建議。例：①If you should see Celia, give her my best wishes.②If you should be interested in our offer, please contact us.

題目來源：2015全品語法快練高中英語新課標(biāo) > 綜合訓(xùn)練（三）

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