-----of last term,students had made lots of new friendsa.by the end b. in the end c.at the end d. to the end

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-----oflastterm,studentshadmadelotsofnewfriendsa.bytheendb.intheendc.attheendd.totheend-----oflastte

-----of last term,students had made lots of new friendsa.by the end b. in the end c.at the end d. to the end
-----of last term,students had made lots of new friends
a.by the end b. in the end c.at the end d. to the end

-----of last term,students had made lots of new friendsa.by the end b. in the end c.at the end d. to the end
选A,
从第二个句子中的had made可以看出,是过去完成时.
而by the end的句子中,时态就是过去完成时

选A是到上学期末...