It is along the Mississippi River ____ Mark Twain spent much of his childhood.
问题描述：
It is along the Mississippi River ____ Mark Twain spent much of his childhood.
A.how B.which C.that D.where
____ a certain doubt among the people as to the practial value of project.
A.It has B.They have C.It remains D.They remains
It _____ John and Mike who cleaned the room.
A.are B.were C.was D.has been
Will you mend the cleaner yourself ,______ shall we ask someone else to fix it
A.and B.so C.or D.for
答案CDCC
需要解释原因
答
1.Mark Twain spent much of his childhood.这是句子.前面+THAT
2.主语搞懂就成.
3.IT 所以A.B排除.（只能用3单）,who cleaned the room 定语从句.所以前面用has been.
4 2选1的句式,所以用or（或者）,用中文解释带进去试试就知道