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