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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
John _____ up early since his childhood.
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.