The students are _____ games in the classroom. [ ]
A. play
B. playing
C. to play
答案:B
I bought two film tickets yesterday, _____ I paid 40 dollars.[ ]
A. which
B. at which
C. when
D. for which
对同品种、同强度等级的砌筑砂浆,湿拌砌砂浆应以()为一个检验批,干拌砂浆应以()为一个检验批;不足一个检验批的数量时,应按一个检验批计。
A.10m3
B.30m3
C.50m3
D.50t
E.100t