几个英语的问题让某人成为他们的员工(意思接近这个)___ sb on their staff.A have B invi

几个英语的问题
让某人成为他们的员工(意思接近这个)
___ sb on their staff.A have B invite C employ D allow
More han 3000 years ago,a people called the Maya settled in the rain forests of ___ is now the country of Guatemala.A where B which C that D what (答案是D,和 选B C的区别)
She is believed to ____the first to use the phrase.A be B being C been D have been 为什么这里的时态是现在完成时?A难道不行么)
If you do get lost,___ ,this is what you should do .A besides B though C then D and
(答案是B,个人认为完全解释不通)
tutmirleid—— 你回答得有些不对啊.
首先第一题的答案是A 不好意思.
第三题 主句 She is believed to ....是人们相信她是第一个使用这个词汇。跟先后有什么关系？