Chocolate is prepared by a complexity process of cleaning, blending, and roasting cocoa beans

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Chocolate is prepared by a complexity process of cleaning, blending, and roasting cocoa beans, which must be ground and mixed with sugar

blending

complexity

mixed with

which

Giải thích

Đáp án B
“complexity” -> “complex”
Ở đây ta cần một tính từ để bổ sung ý nghĩa cho danh từ process phía sau