in his book he gave_on how to learn foreign languages well. A an advice B some - C a few -D some pi

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in his book he gave_on how to learn foreign languages well. A an advice B some - C a few -D some pi

in his book he gave_on how to learn foreign languages well. A an advice B some - C a few -D some pi
in his book he gave_on how to learn foreign languages well. A an advice B some - C a few -D some pi

in his book he gave_on how to learn foreign languages well. A an advice B some - C a few -D some pi
选b
advice 不可数

B

B

b...........