Mr. Green          his lessons when I went into his office.
#36608
A
prepares
B
prepared
C
is preparing
D
was preparing
推荐题目
By the end of last year, they _______ 2,000 English words.
#36368
A
learned
B
have learned
C
had learned
D
learns
Peter has many brothers, but he _________ have any sisters. 
#41604
A
is not
B
can not
C
did not
D
does not