# Find a mistake in the four underlined parts of the sentence and correct it: The twentieth century saw the largest total century population increase ever. At the beginning there were 1.6 billions people and at the end of the century there were 6.1.

A.

The twentieth century

B.

ever

C.

1.6 billions

D.

at the end

Đáp án:C
Lời giải:

1.6 billions → 1.6 billion