We had _____ left the house_____ it began to rain. ()

The couple had no sooner reached home ______ it began to rain.A．untilB．whenC．asD．than

Its high time we ______ cutting down the rainforests.[2006]A．stoppedB．had to stopC．shall s

Hardly had we got on the bus______it began to rain.A．whenB．sinceC．butD．before

______the atmosphere around our Earth, we would not be able to live.A．Had it not been forB

We had given ourselves so little time to get to the airport that it was______ whether we s

As it turned out to be a small party in the house, we______so formally.A．needn"t dress upB