---What can I do for you?
----- If you _____ see Mr. Smith, give him my regards.
A．willB．wouldC．shallD．should
D
should用于if引導(dǎo)的條件狀語從句時(shí)，表示某件事情的可能性很小，意為“萬一”。
【標(biāo)簽】情態(tài)動(dòng)詞
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