2. 外语
  3. 30 years ago, scientists _____ with the theory that protons and neutrons are composed of three smaller particles.

30 years ago, scientists _____ with the theory that protons and neutrons are composed of three smaller particles.

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问题 30 years ago, scientists _____ with the theory that protons and neutrons are composed of three smaller particles.
选项 A、came down
B、came out
C、came along
D、came up
答案D
解析 考查动词短语辨析。come up with表示“想出(计划、答复等)，提出”，符合题意。come out with意为“(突然)说出；提出”。相较之下，不如come up with合适。come down with意为“患……病，染上……病”；come along意为“进展；健康好转；偶然出现；追随”等，后一般不接with。
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