请问一个句子有了vi还要be动词吗?是 they rob food everywhere还是 they are rob food everywhere呢?

相关推荐

• 请问一个句子有了vi还要be动词吗?是 they rob food everywhere还是 they are rob food everywhere呢?
• 等差数列{an}.a1=3,d=2,Sn为前n项和,求S=1/s1+1/s2+.+1/sn
• 等差数列an的前n项和为Sn,已知S6=36,Sn=324,S（n-6）=144（n＞6）,则n=多少?