专四
A. well up in
B. well up to
C. well in
D. well off
固定搭配题。be well up in意为“对……知道得很多,很熟悉”,相当于be well up on。be well up to,be well in是错误表达;;be well off意为“富裕的,处境好的”。因此根据题意,[A]选项正确。
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