求英语单选详解I'm sorry,but I can not give the book to you.It is to

求英语单选详解
I'm sorry,but I can not give the book to you.It is to me _____ your glasses are to you.
A what
B as what
C as
D what as
Did you remember the days ______we worked on the farm?
Certainly. Especially the hard times _____we spent together.
A which,when
B when ,which
C which ,which
D when when
Strange enough,she found her wallet ____she lost it.
A where
B when
C in which
D that
Strange enough,she found her waller in____was once an old temple.
A where
B when
C what
D that
It was July 1,1997 ____saw the return of Hong Kong to the motherland.
A that
B when
C which
D in which
It was on July 1,1997_________I saw the return of Hong Kong to the motherlands.
A that
B when
C which
D in which
不要光给ABCD ，要详解，为什么选A 为什么不选BCD呢？谢谢！