10．--What can I do for you？
--If you __________ see Mr．Smith，give him my regards．（　　）
A．willB．wouldC．shallD．should

分析 --我能為你做什么？
--如果你遇到史密斯先生，替我問候他．

解答 答案；D．這是if的虛擬語氣條件句，和將來相反用should do，選D．表示"如果你遇到史密斯先生，替我問候他．"其他選項中的AB表示意愿，C項用于第一人稱．

點評 考查情態(tài)動詞．在if的虛擬語氣條件句，和將來相反有三種表達方式：
1，用過去式，be動詞用一律用were
2，用were+to do
3，用should+原形動詞

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