问题
选择题
Tom has much difficulty _______ Chinese so he often asks me ______ help
A．to understand; with
B．understanding; of
C．to understand; for
D．understanding; for
答案
答案：D
本题符合结构，主语+have some difficulty in doing sth，表示在做某件事方面有困难，向某人要什么东西，用ask sb for sth，故选答案为D