The issue is hard to ________.
举一反三
- Task 2 Choose the best answers. 9) The issue is hard to ________.
- What are pitfalls of observational studies? A: It might result ethical issue B: it is difficult to ensure a valid counterfactual C: we might not think of all the control variables D: some variables are very hard to measure
- The energy issue is mainly an economic issue instead of a political issue.
- 在linggle中，如果想知道discuss和 the issue之间有没有about，应该在linggle的搜索框中输入（），然后回车。 A: discuss?about the issue B: discuss /about the issue C: discuss*about the issue D: discuss E: about the issue
- issue