where have you been?we have been looking for you everywhere.i(worked out)a teaching plan in my office.为什么这里不填have been working out.had been working out; had been work out
问题描述：
where have you been?we have been looking for you everywhere.
i(worked out)a teaching plan in my office.为什么这里不填have been working out.had been working out; had been work out
答