When I was doing shopping last Sunday, I Mr. Smith in the street.
A. came across
B. came about
C. came along
D. came up with
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(答案→)A. came across
B. came about
C. came along
D. came up with
解析：考查动词短语辨析。A遇见，发现；B形成，产生，发生；C到来，一起走；D想出，提出；句意：上个星期天我在买东西的时候，在街上遇见了斯密斯先生。根据句意说明A正确。