问题
选择题
How much yogurt _____ we _____ to buy? [ ]
A. do, need
B. do, have to
C. are, need
D. did, must
答案
答案：A
搜题请搜索小程序“爱下问搜题”
How much yogurt _____ we _____ to buy? [ ]
A. do, need
B. do, have to
C. are, need
D. did, must
答案：A
N2 (g) +2CO2 ( g) 。 