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999.You can only be sure of ____ you have at present； you cannot be sure of something ____ you might get in the future.
A.that；what
B.what；/
C.which；that
D./；that
1000.Having checked the doors were closed，and ____ all the lights were off, the boy opened the door to his bedroom.
A.why
B.that
C.when
D.where
