一个英语问题I called you just now ,but nobody answer .Where ______

一个英语问题
I called you just now ,but nobody answer .Where ______?.
A were you
B have you gone
C are you
D have you been
_-Happy birthday ,Maty .Here is your present .
A don't ,can
B didn't ,will
C didn't could
D won't ,can
It is said that more than 50 percent of water on the earth ___(be) polluted .
用英语翻译 从此以后