I’sure that they will know （ ）I’ve finished it.A.because B.before C.since D.when

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• I’sure that they will know （ ）I’ve finished it.A.because B.before C.since D.when这是一道选择题.
• I’sure that they will know （ ）I’ve finished it.A.because B.before C.since D.when
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