One third of the class _____ agreed to be volunteers to help the aged this vocation.
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A
are
B
is
C
has
D
have
推荐题目
 In this experiment, they are woken up several times during the night, and asked to report what they__.
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A
had just been dreaming
B
are just dreaming
C
have just been dreaming
D
had just dreamt
      They ___ the game.
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A
are disappointed at losing
B
disappoint
C
are disappointing
D
are disappointed
The poor old man with his two daughters ___ in the street.
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A
was seen to beg
B
were seen to beg
C
was seen begged
D
were seen begging