题目内容
It was ______ the old worker came that we______ the experiment.
A.until;didn’t begin B.not until; began C.until; began D.not until; didn’t begin
B
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题目内容
It was ______ the old worker came that we______ the experiment.
A.until;didn’t begin B.not until; began C.until; began D.not until; didn’t begin
B