下面补充例句中的“become”,为什么不能用“became”呢?As software programs become obsolete so quickly these days,many companies are starting to hire their own staff of programmers.

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下面补充例句中的“become”,为什么不能用“became”呢?As software programs become obsolete so quickly these days,many companies are starting to hire their own staff of programmers.

下面补充例句中的“become”,为什么不能用“became”呢?As software programs become obsolete so quickly these days,many companies are starting to hire their own staff of programmers.
下面补充例句中的“become”,为什么不能用“became”呢?
As software programs become obsolete so quickly these days,many companies are starting to hire their own staff of programmers.

下面补充例句中的“become”,为什么不能用“became”呢?As software programs become obsolete so quickly these days,many companies are starting to hire their own staff of programmers.
软件还在发展,不是说就过去发展,现在没发展了.是一个持续性的概念,所以前面不用过去式,用一般现在式.these days表示的意思包括现在

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