A:①②
B:②④
C:②③
D:③④
将下列句子改为被动语态(1)I sent a letter to you last month.____(2) Do we use it for cooking?____(3) Where did you build the bridge?____(4) Mother tells me a story every day.____(5) Can he finish his homework on time?____
下列现象的微观解释中,不正确的是( )