- Was it because of his laziness he didn't do the experiment successfully?- No it was bec

问题补充：

- Was it because of his laziness he didn do the experiment successfully?

- No, it was because of his carelessness.

A. that

B. while

C. for

D. as

答案：

(答案→)A. that

B. while

C. for

D. as

解析：句意：--是因为他的懒惰才没有成功的做实验的吗？--不，是因为他的粗心。这里用的是强调句的一般问句，结构是：Is/Was it +强调部分+that…，判断是否是强调句的方法是：去掉强调结构，如果这句话仍然成立，就是强调句，这句话如果去掉强调结构是： he didn do the experiment successfully because of his laziness.所以是强调句，所以选A。