－These books are too heavy for me to carry.

－ _____. [ ]

A. You may ask for help

B. I will give you a hand

C. I will do you a favor

D. I'd come to help

“时教必有正业，退息必有居学”出自（ ）

A．《大学》

B．《论语》

C．《孟子》

D．《学记》