Paul works in a power plant.It__two months since he_a co

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Paul works in a power plant.It____two months since he___a college student
A.is,was B.is,became
C.was,was D.had been,became
答案应该选A,为什么?请说明原因,

因为前面是works,因此是现在经常性或习惯性的动作或状态,符合一般现在是定义,而且陈述一般事实,因此第一个空是is,又因为since后面跟一般过去时,因此是was.而become也可以代替be动词,一般来讲某种职业或---学生前面be动词比较常用写,所以最佳就选a了,明白了吗?再说,如果用过去完成时就表示过去的过去,而这里并不是表示此意,前面动词加了S,为一般现在时,所以D显然不对

Paul works in a power plant.It____two months since he___a co Paul works in a power plant.It ___ two months since he ___ a He works a plower plant.为什么works要加s? In the 12 months since I last wrote to you,a lot ----(happen Assumed power plant details are given in Table 1 He works as a cook in a restaurant.改为一般疑问句 ____he____as a co What is the plant like after a few months? (19) My father is a programmer and he works in ________.A.co thermal power plant 火力发电厂 electric-power-plant是什么意思 The Power Plant 歌词 the power plant 是什么意思