TOEFL Grammar - Find the error

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

Find the error in the following sentence


For many years the car industry has been known about emissions problems in diesel cars, yet still promoted these cars as being as clean as gasoline engines.

A. For many years
B. has been known
C. promoted
D. as clean as

Click here for the correct answer:

For many years the car industry has known about emissions problems in diesel cars, yet still promoted these cars as being as clean as gasoline engines.

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