问题

While reading, you’d better make a mark ___ you have any questions.

A:on which
B:at which
C:the place where
D:where

正确答案是：

同类题型

The young man spent as much time as he _______ the experiments. — No wonder he succeeded _______.

is known to all, hard work will_____ in time

It was the first time in my life _______ Ihad experienced the UK.

The professor reminded me of what I would _____ have forgotten [ ]

Is that the reason ________he explained to all at the meeting for his carelessness in his work? Actually we think he is a man who is hard ________ himself especially in work.