—I phoned you at 7:00 this morning. But there was no answer.—Well, maybe I _________ morning exercises at that time.
#39781
A
was doing
B
did
C
is doing
D
would do
推荐题目
There  _______ an English party this weekend.
#41823
A
is
B
are
C
is going to be
D
is going to have
Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
#38768
A
explains ; to
B
has explained ; for
C
has explained ; to
D
explained ; with
We will go for a picnic if it_____ this weekend. 
#36947
A
will rain
B
rains
C
won ’ t rain
D
doesn’t rain