The director wants to make sure no one will solve the mystery until it ________ at the end of the horror film. 
#38260
A
is explained
B
will be explained
C
explains 
D
has explained
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In fact he knows this place very well, for he ________ there three times.
#36329
A
has been
B
has been to
C
has gone
D
has gone to
A lot of trees ______ in our school last year.
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A
plant
B
planted
C
are planted
D
were planted
These young trees must ______.
#41993
A
look after well
B
be look after well
C
be looked well
D
be looked after well