Not until a monkey is several years old________ to exhibit signs of independence from its mother.A:before it begins B:it does begin C:does it begin D:does begin it

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Not until a monkey is several years old________ to exhibit signs of independence from its mother.
A:before it begins
B:it does begin
C:does it begin
D:does begin it

C
not until位于句首的复合句,从句用正常语序,主句用倒装.