中原工学院 / 大学英语(1)
Generally speaking, _ _ _ _ _ _ _ _ _ according to directions ,the drug has no sid-effect.
A、when taking
B、when taken
C、when to take
D、when to be taken
A、when taking
B、when taken
C、when to take
D、when to be taken
参考答案:
佳题速递: