问题: 几个单选题
1 You____ have separated the two boys. Before
you did that,as a matter of fact,they had
regretted the fight and agreed to make peace
A needn't B mustn't C wouldn't D could't
2 We ____ a man with grey hair at the railway
station,but the man ____ in the crowd before
we could recognize who he was.
A met;has disappeared B met;had disappeared
C had met; disappeared D had met;had disappeared
3 -Your luggage looks very heavy.Would you like
me to carry it for you?
-____ ! I can hardly bear it any longer.
A NO,thanks anyway B That's very kind of you
C It doesn' matter D I can manage it myself
注明一下理由， 最好能够翻译一下，本人不胜感激。
解答:
1.选A 你本来没必要把他们拉开，你那样做的时候，事实上，他们已经后悔打架并同意要和平相处。这句话是虚拟语气，needn't 没必要，mustn't 一定不能，wouldn't D could't 本来不能
根据意思选A.
2.选B 我们在火车站遇到一位白头发的男子，但没等我们认出是谁，他就在人群中消失了。前一句是一般过去时，后一句根据before,disappear的动作发生在could recognize 之前，是过去的过去，用过去完成时。
3.选B 你的行李看起来很重，你愿意让我帮你拿吗？
你真是太好了！我几乎一点都拿不动了。
NO,thanks anyway 是不用，仍然谢谢你。
It doesn' matter没关系
I can manage it myself我自己能行
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