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