请选择ABCD(Y(h4L2W:T He hasn’t heard from his friend _________ last month.7Z(\.e,y+t5Q/q.K3a'J(l*P(e.P
A.since7Z(\.e,y+t5Q/q.K3a'J(l*P(e.P
B.by the end of7Z(\.e,y+t5Q/q.K3a'J(l*P(e.P
C.for7Z(\.e,y+t5Q/q.K3a'J(l*P(e.P
D.until7Z(\.e,y+t5Q/q.K3a'J(l*P(e.P