MR liu______a public house a short time ago A has bought B bought C Was bought Dis bought最近有点惆怅.希望大家能帮一帮无助的我.

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MRliu______apublichouseashorttimeagoAhasboughtBboughtCWasboughtDisbought最近有点惆怅.希望大家能帮一帮无助的我.MRliu___

MR liu______a public house a short time ago A has bought B bought C Was bought Dis bought最近有点惆怅.希望大家能帮一帮无助的我.
MR liu______a public house a short time ago A has bought B bought C Was bought Dis bought
最近有点惆怅.希望大家能帮一帮无助的我.

MR liu______a public house a short time ago A has bought B bought C Was bought Dis bought最近有点惆怅.希望大家能帮一帮无助的我.
B ago 用于过去时

B bought

B

B ago一般过去时的标志
A是现在完成时， C是一般过去时的被动语态，D是一般现在时的被动语态。

MR liu______a public house a short time ago A has bought B bought C Was bought Dis bought最近有点惆怅.希望大家能帮一帮无助的我. public public public But the public backs other elements of Mr.Obama’s agenda.这里back 怎么理解 Mr mr mr. Mr. Mr. mr. Mr MR Mr Mr. mr. Mr mr.