英语改错习题求解答The new technique A(calls for) B(heating) the mixture before C(applied) it to D(the wood )以上这句话 哪里错了 ABCD?

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英语改错习题求解答
The new technique A(calls for) B(heating) the mixture before C(applied) it to D(the wood )
以上这句话 哪里错了 ABCD?

C applied→applying
因为apply这个动作的发出这是人,人把混合物涂在木头上,所以应该用主动的ing形式来引导
这项新技术需要人们在加热混合物之前先把它涂在木头上

C错了,应该是ing而不是被动式!

C
applying
与前面heating一致

Obviously,C should the the answer be,
In this sentence "applied" has it after it,so it is an active form,while "before" is a preposition,so "applied" should be changed to "applying".