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问题: 英语单选

1.A computer is so useful a machine _____we can use everywhere.
A.that B.which C.as D.what
2.-Do you still remember the days_____we spent in the countryside ten years ago?
-Yes,I'll never forget the experience.
A.where B.when C.that D.what
请详细解答,谢谢

解答:

第一个是A so````that句型 太····以至于···
第二个是C that 是作代词,代替前面的the days,在spent后
面作宾语。其他的where when不能作代词