With his attention _____ on his book, he didn’t notice me enter his study.
#90997
A
focusing
B
focused
C
to focus
D
focus
推荐题目
There are many kinds of metals, ______.
#91614
A
each having its special properties
B
having its special properties
C
one has its special properties
D
each has its special properties
 Most of her spare time ______ , she still kept on her research in the library.
#90960
A
occupied
B
had been occupied
C
to be occupied
D
was occupied
With the boy______ the way, we had no difficulty ______the village.
#91363
A
to lead; to find
B
leading; to find
C
leading; finding
D
to lead; finding