It was NOT UNTIL 还是UNTIL his mother came in that the boy turned the TV off.

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ItwasNOTUNTIL还是UNTILhismothercameinthattheboyturnedtheTVoff.ItwasNOTUNTIL还是UNTILhismothercameinthatt

It was NOT UNTIL 还是UNTIL his mother came in that the boy turned the TV off.
It was NOT UNTIL 还是UNTIL his mother came in that the boy turned the TV off.

It was NOT UNTIL 还是UNTIL his mother came in that the boy turned the TV off.
应该用NOT Until;属于强调句型:It was not until .that

It was not until his mother came in that the boy turned the TV off.

not until