-- Will you go to the dinner party?
-- I will go as long as Jenny __________.
A:is going
B:went
C:has gone
D:goes
实验室常用下列装置来制取氧气:
闭合电路的一部分导体,在磁场中作切割磁感线运动,电路中产生电流,根据这一原理可制成()