Joan is not here. She _____ in the next room.
A:does some washing
B:is doing some washing
C:will do some washing
D:has done some washing
已知数列an是等差数列,且a1+a4+a7=2π,则tana3+a5的值为( )
回答下列问题:
点A 为数轴上表示-2的动点,当点A沿数轴移动4个单位长到B时,点B所表示的实数是( )
1是( )。