Here are many . [ ]
A. dress
B. dresses
C. dresss
答案:B
酒石酸的提取过程中的沉淀碳酸钙与氧化钙的比例是1:2。
Where did you find the professor who made the speech yesterday?” “It was in the hall ______ the students often have a meeting.”
A.where
B.which
C.that
D.when