at once:马上。immediately:马上,例如:It's getting late.We must go back home immediately.越来越晚了,我们得马上回家。soon:很快,例如:We'll have lunch soon.我们很快就要吃午饭了。now:现在,例如:If we leave now we'll be there before dark.如果我们现在就离开,我们在天黑前就会到那里了。early:早,例如:Mary gets up very early.玛丽起得很早。选项B与题干中at once的含义相近,故答案为B。
第4题:
He cannot answer this question at once,but can find the answer to it from that book.
A:soon
B:immediately
C:now
D:early
答案:B
解析:
at once“马上”,immediately“马上”,例如:It's getting late.We must go back home immediately.越来越晚了,我们得马上回家。soon“很快”,例如:We'll have lunch soon.我们很快就要吃中午饭了。now“现在”,例如:If we leave now we'll be there before dark.如果我们现在就离开,在天黑前就到那里了。early“早”,例如:Mary gets up very early.玛丽起得很早。
第5题:
There is no reason why you shouldn't tell them beforehand that you are leaving.