问题

I can’t learn English well. What can I do, Mr. Smith— Tom, ________ is difficult if you work hard.
A:I’m sorry to hear that.
B:OK. Let’s make some sandwiches.
C:That’s all right.
D:Never mind.;
B:OK. Let’s make some sandwiches.
C:That’s all right.
D:Never mind.;
正确答案是: