People (?) a general understanding of the water problem(A) are in lack (B) lack of (C) lack (D) are lacking of 选那个,急

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People (?) a general understanding of the water problem(A) are in lack  (B) lack of   (C) lack  (D) are lacking of 选那个,急
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People (?) a general understanding of the water problem(A) are in lack (B) lack of (C) lack (D) are lacking of 选那个,急
People (?) a general understanding of the water problem
(A) are in lack
(B) lack of
(C) lack
(D) are lacking of
选那个,急

People (?) a general understanding of the water problem(A) are in lack (B) lack of (C) lack (D) are lacking of 选那个,急
c 作动词,缺乏

C