how many advice have you given to your friend?用advice还是用pieces of advice?只有一个对

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• how many advice have you given to your friend?用advice还是用pieces of advice?
• how many advice have you given to your friend?用advice还是用pieces of advice?只有一个对
• the scientists have collected much____about the south pole.A advice B opinions C storiesD information
• 24.This is the microscope ______ which we have had so much trouble.A) at B) from C) of D) with为什么是D呢,of不行吗