the first thing when you go to school is _ the teacher a,greeting b,to greet c,greet d,greeted选A还是B呢
问题描述：
the first thing when you go to school is _ the teacher a,greeting b,to greet c,greet d,greeted
选A还是B呢
答
选A
答
B
这个结构相当于分开的：the first thing to do
第一件要做的事.