-Hello! Is Mr. John in the office?
-Yes. But I'm sorry. He is busy __________ and can't speak to you.
| A．at once | B．at present |
| C．at the end | D．at first |
相关试题
.
Sometimes she’d ask the driver to stop in front of a particular building and would sit _________ into the darkness, saying nothing.
| A．staring | B．glaring | C．watching | D．noticing |
.
— His mother was ill and he had to look after her in hospital.
— That’s _________ he was absent from the meeting.
| A．because | B．what | C．why | D．which |
.
. The naughty boy _________ to me that the hen _________there just now had _________ two eggs the day before.
| A．laid; laid; laid | B．laid; lay; lain | C．lied; laid; lai n |
D．lied; lying; laid |
.
. After going into the concert hall, the mother _________ a friend and went over to
greet him.
| A．searched | B．knew | C．spotted | D．realized |
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