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1.John shut everybody out of the kithcen ____ he could prepa

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1.John shut everybody out of the kithcen ____ he could prepare his grand surprise for the party.
A.which B.when C.so that D.as if
我觉得这道题目除了A可以排除意外,BCD都可以选,而且翻译都没问题.
2.The European settlers did not know what corn was ____ they received gifts of corn from the local Indians.
A.when B.until C.while D.before
我知道这道题目选until,是not…until的结构,但是我觉得选择D也说得通“在他们收到印第安人用玉米做的礼物之前,英国人并不知道玉米是什么.”
3.Mike was one of the people I used to play music with ____ I lived in Ireland.
A.since B.as C.after D.when
我觉得这道题目CD都可以选,I’m really confused :(
4.His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.
A.after B.before C.when D.as
这道题目句子也看不大懂,怎么选也不知道:(
现在就是第四题有些疑问。
如果选择before,前面貌似确实要改为过去完成时,但是这里好像有一个any起了作用,而使得我们不得不选before,但是我还没琢磨透,
1、C so that 以便于
2、B 正如你所说的 not ……until 直到什么才~学英语要讲究语法
3、D 当我在爱尔兰时 关键词used to过去常常 说明发生在过去 用when~当……
4、B 关键词是any