________ he driven more carefully, the accident would not have happened the other day.A. Be B. Had C. Has D. Would have
So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.
According to an old proverb, red sky at night often indicatesfine weather the next day.
单项填空 (共15小题, 满分15分) ——May I take your order now? —— . —— OK, I’ll come back in a few minutes.
He set off down the main street. He _____.
He wanted to measure temperatures. He wanted to _____ them.