They were busy ________ an experiment when I came.
#92445
A
doing
B
to be doing
C
with doing
D
to do
推荐题目
The person     at the meeting is famous        an actor.
#97129
A
referred ; for
B
referred to ; as
C
referred to ; for
D
referring ; as
Mike apologized for _______ to inform her of the change in the working plan.
#88613
A
his being not able
B
him not to be able
C
his not being able
D
him to be not able
Prices of daily goods ____ through a computer can be lower than store prices.
#95035
A
are bought
B
bought
C
been bought
D
Buying
The boy is often found _____in reading books.
#96644
A
absorbs
B
is absorbed
C
absorbing
D
absorbed