The reason ____ the people in the mainland go to Hong Kong to buy formula is that people are not convinced ____the safety of formula produced in the mainland.
A.that; at | B.why; at | C.why; of | D.what; of |
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The reason ____ the people in the mainland go to Hong Kong to buy formula is that people are not convinced ____the safety of formula produced in the mainland.
A.that; at | B.why; at | C.why; of | D.what; of |