问题
选择题
It was nearly an hour ____the sleeping pill ______effect.
A．when; took
B．before; took
C．since; had
D．before ; had
答案
答案：B
It was+一段时间+before…表示“过了….才…”take effect 表示（药等）见效；（法规等）生效
搜题请搜索小程序“爱下问搜题”
