The passage mainly tells us ________. "Certain other combinations are employed to indicate such things as End or Message of Err

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问题 The passage mainly tells us ________.
"Certain other combinations are employed to indicate such things as End or Message of Error. "means _________.

选项 A、The Morse code can be only sent End of Message or Error
B、It tells us what is the end of Message or Error
C、End of Message or Error can be made up of certain other combinations
D、The Morse code I made up of dots and dashes

答案C

解析 只要将该句意思弄明白了,即使不读文章也不难判断出选项C正确。
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