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John _____ up early since his childhood.

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John _____ up early since his childhood.
A.is used to get B.has been used to get C.used to get D.has been used to getting
Why Where is the mistake in
我觉得这个题就该选D
used to 过去常常
be used to doing 习惯于,这里A,B都错,因为to是介词
而since his childhood从他孩提时起,明显的完成时态.