I think ________ good knowledge of English is ________ great help when you are traveling around the world.
A.不填;a | B.a; a | C.a; the | D.a; 不填 |
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I think ________ good knowledge of English is ________ great help when you are traveling around the world.
A.不填;a | B.a; a | C.a; the | D.a; 不填 |