Messages ______ be changed from sound into electricity before they ______ be sent by radio.
#90077
A
must; will
B
have to; can
C
can; must
D
need; may
推荐题目
She insisted that she ______ not guilty , but we insisted that she ____ into prison
#87975
A
was; be put
B
be ; was put
C
should be; was put
D
was; should put
Even if I had taken part in the 400-meter relay race in the sports-meet, our class___________ the race. I’m ________ weight this year.
#88043
A
might not have won; gaining
B
would not have beaten; putting on
C
can not have defended our title; losing
D
must not have achieved; acquiring
—I knocked but nobody answered the door. ----They _____asleep then and didn’t hear you.
#88169
A
must be
B
should be
C
must have been
D
should have been
— We expected you yesterday.— I’m sorry, I you to say that I couldn’t be here until today.
#87786
A
must have called
B
would be calling
C
could have been calling
D
should have called
. If my father ______ here yesterday, he would have stopped me from going surfing.
#86775
A
had been
B
were
C
should be
D
has been