问题

You have to turn off your mobile phone. This is the class rule. – ______
A:OK. Thank you for letting me know.
B:Yes, I’ll take your advice.
C:I couldn’t agree with you more.
D:Sorry, I didn’t hear that.;
B:Yes, I’ll take your advice.
C:I couldn’t agree with you more.
D:Sorry, I didn’t hear that.;
正确答案是: