It is doubtful if we can get the engine working before 7 o 'clock.

我们七点之前能否使发动机正常运转值得怀疑。

youdao

It is doubtful if we can get the engine working before 7 o 'clock.

我们七点之前能否使发动机正常运转值得怀疑。

youdao