TOEFL / IELTS Grammar - Find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,093 admin ✭✭✭✭✭✭✭

Find the error in the underlined words in the following sentence:

The home computer, which is now being replaced by smartphones and tablets, has become an important part of most households beginning in 2001 with the release of Windows XP.

a. which is now
b. has become
c. part of most
d. the release of 

Click here for the correct answer.

The home computer, which is now being replaced by smartphones and tablets, had become an important part of most households beginning in 2001 with the release of Windows XP.

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