问题

____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of

A:It is
B:There is
C:This is
D:That is

正确答案是：

同类题型

＿＿many times, he still didn’t make sense of it

Look! One of the girls ______the door.

It was not 　　he took off his dark glasses 　　I realized he was a famous singer.

, where are you going –To the supermarket.

I will keep on trying, ______ I might fail a thousand times