【探究寻规】 用所给动词的适当形式填空。 1. You know, I ________________(look) for a job for three months, and this is my first formal interview. 2. He _____________(lie) in bed for two weeks. 3. The little boy is dirty all over because he _______________ (play) in the mud all the morning. 4. I ________________(wait) for an hour and he still hasn’t turned up.

have been looking

has been lying

has been playing

have been waiting