they have been in nanjing since ______.A.three weeks B.three days before C.four months agoD.next weekseveral days has passed _____ the air carsh happened.A.since B.after C.as D.before ·
问题描述：
they have been in nanjing since ______.A.three weeks B.three days before C.four months ago
D.next week
several days has passed _____ the air carsh happened.
A.since B.after C.as D.before ·
答
C,B
答
They have been in Nanjing since four months ago.
这种句子中since 一般加时间名词加ago
Several days has passed since the air carsh happened.
自从坠机那天起已经过了好几天了.
since 从.时候起