112. afraid of …, good at … 等 of/ at/ for 等 (介詞) + -ing – Grammar in use Course Content 112. afraid of …, good at … 等 of/ at/ for 等 (介詞) + -ing Grammar in Use Unit 112.1 Grammar in Use Unit 112.2 Grammar in Use Unit 112.3 Grammar in Use Unit 112.4 Grammar in Use Unit 112.5
