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TOEFL Grammar - Find the error

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

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

The machine must be connected to a server in order to work properly, so before attempt to operate the machine test that it is connected.

A. must be connected
B. in order to work
C. so before attempt
D. test that it is

Click here for the correct answer:

The machine must be connected to a server in order to work properly, so before attempting to operate the machine test that it is connected.
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