分类：教育/科学-学习帮助
问题：单项填空isisbiggestlaboratory_____we 
 is is biggest labtory _____ we have ever built in our school.a. which b. what c. where d./
回答： is is biggest laboratory _____ we have ever built in our school.
 d./ 
同上，用that引到的从句，that有时可以省略，所以不用填。