题目：
Although she had little experience working with computers,
Ms. Lopez is often able to assist customers ______ technical support.
A.require
B.requiring
C.requirement
D.requried
答案是Ｂ
解题思路：需要形容词，所以剩Ｂ、Ｄ可以选，而形容的对象是technical support
所以应该是要被动式，所以我选Ｄ。
恳请各问大大解答

to assist customers who require technical support.

感谢Ｙ大...原来是在形容customers

如果题目to assist technical support _____by customers,就是你选的D

谢谢您的补充