They thought of a detailed plan___ he could finish the project ahead of timeA,whichB,thatC,by whichD,in which
问题描述：
They thought of a detailed plan___ he could finish the project ahead of time
A,which
B,that
C,by which
D,in which
答
选择C。by which在这相当于by the plan。OK?
答
句子可以改写成
He could finish the project ahead of time by a detaied plan he thought of.
所以选C
答
答案是C,句子的大意是:他们想到了一个详细的计划,通过这个计划他们能够提前完成这个工程项目.主要考察定语从句
答
B 前句They thought of a detailed plan，句子完整。后句： he could finish the project ahead of time。句子完整。所以写that，是同位语从句。后句是pian的解释，
句子意思：他们认为他可以提前完这个详细的计划。
答
C. by which
答
C.
he could finish the project ahead of time by a detaied plan he thought of.
句子可以改写成这样
因为有个by不能省去
那么就不能用that去填，要用which+介词（by）
答
A