一道英语动词时态训练题 IT IS LATE AT NIGHT.DAD _STILL_(WORK) AT THE DESK

问题描述:

一道英语动词时态训练题 IT IS LATE AT NIGHT.DAD _STILL_(WORK) AT THE DESK
TELL BOB TO TURN OFF THE LIGHTS BEFORE HE _(GO) OUT

is working 现在进行时 系动词加动词的 ing 形式