请问几个高中英语单选题，请英语大神瞧瞧

Question

1.-Alice,why aren't you at work today?
-I _______a day off.
A.have given B.have been given C.gave D.was given
答案B,我选的D
2.Unless he ______the place before,he won't introduce it to us in such detail.
A.has visited B.visits c.visited D.was visiting
答案A，我选的C
3.I got there at 10 o'clock,but she_____30minutes earlier than me.
A.has arrived Bhad arrived C.would arrive D.was arriving
答案B，我选的A

Answer 1

1.问的是今天，是现在时，因为已经请过了假，所以用完成时。
没有过去时的时间标志，不能选D
2.有before可以是过去时也可以是完成时，主句中用的是将来，所以用现在完成时
3.过去的过去用过去完成时
我到这里是10点（这里是过去时），她比我早30分钟（显然是在我之前到的）

Answer 2

1.-Alice,why aren't you at work today?
-I ___B____a day off. ------你正在休息，不是得到了吗？所以是“完成时被动语态”
A.have given B.have been given C.gave D.was given
答案B,我选的D
2.Unless he ______the place before,he won't introduce it to us in such detail.
A.has visited B.visits c.visited D.was visiting
答案A，我选的C------除非他以前去过，并且对那个地方有印象，------这是他介绍的首要条件。
3.I got there at 10 o'clock,but she___B__30minutes earlier than me.
Bhad arrived-----这强调过去的过去。------她先到（是过去完成时），我後到（一般过去时）