单项选择题 please select the componentsoftask in Task-Based Language Teaching.①purpose②context③process④function of language⑤product

未知题型 电容元件的电容与其所带电荷成正比，与其电压成反比

单项选择题 A teacher showed students an example and explained the usage of past perfect tense,and ask students to listen“past perfect tense”sentences by imitating that example.What’s teachers grammar teaching me