[題目] 請各位幫忙一下解這題:)
書名：600 essential
版本：
頁數：p127 word review#4 第5題
題目：
A supplier who has chronic trouble ________his obligations to a
customer will quickly lose.
(A)fulfill
(B)fulfills
(C)fulfilling
(D)fulfillment
疑問：答案是C,為什麼不能選B呢 謝謝各位解答^^
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