[ Grammar ]
___ hour ago we met ___ history teacher.
A. A / an
B. A / a
C. An / a
D. An / an

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Grammar › ViewWe often ……………. our relatives in Summer.
A. visit
B. visited
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We have to apply effective measures to save many plant and animal species……..extinction.
A. from
B. in
C. for
D. on