题文
His English is improving _______, which makes both his parents and his teacher happy.
| A.now and then | B.little by little |
| C.sooner or later | D.one after another |
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His English is improving _______, which makes both his parents and his teacher happy.
| A.now and then | B.little by little |
| C.sooner or later | D.one after another |
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