"______does Mr. Johnson go to London on business " "At least once a month."

I suppose you are not serious, ______A．do IB．don't IC．a...

单项选择题I suppose you are not serious, ______

It was not until it got dark______working.A．that they s...

单项选择题It was not until it got dark______working.

With the bridge______, there was nothing for it but to ...

单项选择题With the bridge______, there was nothing for it but to swim.