Your friends were all worried about you were sick.A. thatB. whichC. whatD. the fact that

问题补充：

Your friends were all worried about you were sick.

A. that

B. which

C. what

D. the fact that

答案：

A. that

B. which

C. what

(答案→)D. the fact that

解析：句意：对于你生病了的事，你的朋友们都非常担心你。the fact that引导同位语从句，that在句中不做任何成分，也没有意思，只起连词作用。故选D

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