21.It was not until dark he found he thought was the correct way to slove the problem.

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No sooner it grew dark than Hardly did it grow dark when It was not until dark that It was until dark that

No sooner it grew dark than Hardly did it grow dark that Scarcely had it grown dark than It was not until dark that

until，that not until，that not until，when when，then

Not until dark It was until dark It was not until dark that It was dark that

No sooner it grew dark than Hardly did it grow dark when It was not until dark that It was until dark that

when; that until; when when; then until; that

Not until dark It was until dark that It was not until dark that It was dark that

No sooner it grew dark than Hardly did it grow dark when It was not until dark that It was until dark that

No sooner it grew dark than Hardly did it grow dark that It was dark after It was not until dark that

when; that until; that until; when when; then

when; that until; when when; then until; that

No sooner it grew dark than Hardly did it grow dark that Scarcely has it grown dark than It was not until dark that

until，that not until，that not until，when when，then

when; that until; that until; when when; then

what, that until , that until, when when , then