A./; an | B.the; the | C./; the | D.the; an |
A.a; the | B./ ; a | C./; the | D.the ; a |
A./ | B.a | C.an | D.the |
A.a; the | B.the; a | C.a; / | D./; a |
A.the; the; the | B.a; the; the | C.the; /; / | D./; the; the |
A.an; 不填 | B.不填; the | C.an; the | D.the; the |
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