A:went
B:go
C:are going
D:will go
I like to eat apples, __________ I don't often eat them.
—What a lovely card! Where did you buy it?—I made it by _______.
如图所示,匀强磁场与圆形导体环平面垂直,导体ef与环接触良好,当ef向右匀速运动时( )