在正方体ABCD﹣A1B1C1D1中,则二面角D1﹣AB﹣D的大小为( ).
45°
He finally got sitting in an office all day, and longed for a more active life.
A.interested in
B.tired of
C.pleased at
D.satisfied with
— Do you know where John is?
— He was going to meet me earlier, but he didn't _____. [ ]
A. stay up
B. put up
C. show up
D. give up