Jane has ______ from school for 2 years. When she ______ the happy time, she always misses her teachers and classmates.
A:graduated; think back to
B:been away; thinks back to
C:been away; thinks about
D:graduated; thinks of
函数f(x)=log3x-(12)x-2的零点所在区间为( )
琼州海峡位于( )