A.a; a | B.the; a | C.the; the | D.a; the |
A.a; the | B.the; a | C.不填; a | D.a; 不填 |
A.a; on traveling | B.the; to travel | C.the; on traveling | D.at; to travel |
A.the, a | B./ , a | C./ , / | D.a, the |
A.have; the | B.have; a | C.has; the | D.has; a |
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