以下表达式哪些不会引起运行时错误？
A."john" + " was " + " here" B."john" + 3 C.3 + 5 D.5 + 5.5 E.都会引起运行时错误
"john" + " was " + " here"
"john" + 3
3 + 5
5 + 5.5
都会引起运行时错误
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