10.The modem automobile is a __ composed of more than 14,000 parts.
(A) complex technical system
(B) system of complex technical
(C) complex technical system that
(D) system is technically complex
答案是A
请问为什么不能用C,这2个我常常搞混,有时后不加THAT,答案是要加THAT的,有时后加了THAT,答案不加THAT
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