A:①②
B:①③
C:②③
D:②④
在“探究‘酸雨’对种子萌发的影响”实验中,四位同学作出的假设,其中叙述不恰当的是
—I am really struck by your spoken English. You speak so fluently. Have you been abroad?
—Yes. I ______ in London for two years.