The director wants to make sure no one will solve the mystery until it ________ at the end of the horror film. 
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A
is explained
B
will be explained
C
explains 
D
has explained
推荐题目
My mother was cooking while I_________ the radio.
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A
listened to
B
have listened to
C
was listening to
D
am listening to
 The mobile phone has influenced people’s life a lot since it _______.
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A
invents
B
invented
C
is invented
D
was invented
Look! The Greens _______ in the room.
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A
reads
B
were reading
C
are reading
D
read