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THEY ( HAVE STUDIED / HAS STUDIED / STUDIED / ARE...
THEY ( HAVE STUDIED / HAS STUDIED / STUDIED / ARE STUDYING )______...
200 CAU TRAC NGHIEM TA 9
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10.
They ( have studied / has studied / studied / are studying )__________English for 10 years.
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10.
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200 CAU TRAC NGHIEM TA 9