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
B:There is
C:This is
D:That is
正确答案是：
同类题型
It is so crowded Where is Jack—He is very tall We can easily _____ himin the crowd
．He________ an English club last year and has improved his English a lot.
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He______ on this paper for ten minutes but he______only about sixty words
Is Sandy your classmate— Yes. She sits between Tom and _____________.