1.不用特别详细．

1.不用特别详细．
就是crazy应该和in 还是about搭配.
2.Dashan can speak Chinese very well because he _____ China for many years.
A.has been to B.has been in C.has come to D.has gone to
C和D被我排除了,因为瞬间动词.
但是我没有见过has been in.
请问为什么答案给的是B不是A.这个句子是现在完成时么.
3.I left my umbrella in the classroom.Could you wait___ I go back to get it?
A.when B.if C.before D,while
为什么答案给D不选B．
这句话的意思不就是说：我要去拿伞让你等下”么?
如果用IF意思是：如果我去拿伞你能等下么?
那如果选D为什么又不选A?
是答案错了么
4.Can you describe___?
A.what your pen pal is like
B.how your pen pal is like
C.what does your pen pal look like
D .how your pen pal looks like
答案给的适A．
这个我是一点都不理解