Question

Since its start, WeChat ______into the most popular messaging communication service in China.

A. has developed       B. developed

C. develops             D. was developing

Answer

A

【解析】

试题分析：考查时态。本句的时间状语是since its start，自从它开始以来，“since结构”在句中作时间状语，主句通常使用现在完成时，故A正确。

【名师点睛】

现在完成时是一个与过去和现在都有关系的时态，因此，具有这样时间特点的状语都可以与现在完成时连用。

1.与表示一段时间的状语连用，如"for+时间段"，"since+时间点"。

如： We have lived in this city for more than 40 years. 我们在这个城市已生活了40多年。

We have lived in this city since 1958.

我们从1958年起就住在这个城市里。

从以上两个例句我们可以看出，与表示一段时间的状语连用时，

谓语动词常为stay, live, teach, learn, work, sleep, read, wait, keep等具有延续意义的动词。

2.与笼统地表示过去的时间状语连用，如already, never, ever, just等。如：

I've just found this library book. 我刚刚找到这本图书馆的书。

How beautifully she sings! I have never heard a better voice.

她唱得多美啊!我还从来没听到过比这更优美的歌喉。

3.与表示包含过去和现在的一整段时间的状语连用，

如lately, recently, in the past few years, these few years, these days, up to now, so far等。如：

How have you been recently? 你近来状况如何?

The famous writer has written a new book in the past two years.

那位著名的作家在过去两年时间里写了一本新书。

Have you seen her parents these days? 这些天你看见她的父母了吗?

The Browns have visited a lot of places in China so far.

迄今为止，布朗一家已经参观了中国的许多地方。

注意：现在完成时不能与单纯表示过去的时间状语连用，

如yesterday, last week, in 2002, three days ago等

考点：考查时态