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TOEFL Grammar - Find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,296 admin ✭✭✭✭✭✭✭
edited October 2016 in TOEFL Test

Find the error.


There are 4 underlined sections in the text below. Select the one which is wrong.

One popular recent method of working is to concentrate for while, usually 30 minutes; then to take a 5 minute break.

A. recent
B. to concentrate
C. while
D. to take

One popular recent method of working is to concentrate for a while, usually 30 minutes; then to take a 5 minute break.

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