Which用法((急

Some chemicals _ for makeup were deadly to our body.
(A)using
(B)which used
(C)used
(D)to use
答案是C 請問為什麼B不能呢??
更新: 那請問能用 are used 嗎?
更新 2: 若是選項有 are used 可以選嗎?
4 個解答 4