—I have to ask a(n) of you because the luggage is too heavy for me.—Oh with pleasure.A.

问题补充：

—I have to ask a(n) of you because the luggage is too heavy for me.

—Oh, with pleasure.

A. satisfaction

B. bonus

C. assessment

D. favor

答案：

A. satisfaction

B. bonus

C. assessment

(答案→)D. favor

解析：句意:--我不得不请你帮忙，因为行李对于我来说太重了。--我愿意帮忙。Satisfaction满意；bonus奖金，红利；assessment评定，评估；ask a favor of请帮忙。根据句意故选D。