英语选择.说明原因
问题描述：
英语选择.说明原因
说明原因
._______the office,the foreign visitors were shown round the teaching building.
A.Having shown B.Showing C.Has shown D.Having been shown
.The library's study room is full of students _________for the exam.
A.busily prepared B.busy preparing\x0b C.busyly prepare
D.are busily preparing full
答
D ,第一题有先后顺序,所以要加Having
A （which are）busy preparing