单项选择。 — Hello, who's ___? — Hello, ___ is Wang Fei speaking. [ ] a. this; that b. that; this c. this; this d. that; that
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参考答案:
举一反三
【简答题】These instruments should be turned on and checked before we start our work. (switch on)5.These instruments should be turned on and checked before we start our work. (switch on)