-----Is this the first time you______ Chengdu?
-----No. But the first time I______ here, the city wasn’t so beautiful
A. visited; came B. visited; have come
C. have visited ; have come D. have visited; came
Has the doctor _______ called for?
A. referred to being B. referred to been
C. referring to being D. referred to be
Every student is required to watch the teacher carefully before ___ the chemistry experiment.
A. performing B. taking C. picking D. having
I am a stranger here. So the city isn’t familiar ______ me.
A. with B. by C. in D. to
—We want to sit at the table near the window.
—I’m sorry，but it________ already.
A．has taken B．took C．was taken D．has been taken
I would __________it if you would let me deal with this by myself.
A. appreciate B. inspect C. protect D .replace
