Directions: Select the segment of the sentence that contains a grammatical error. If there is no error mark 'No error' as your answer.
Millions of years ago the mica schists surrounding the old Brandberg West Mine had become folded and concertinaed by enormous horizontal pressures.
1
Millions of years ago the mica schists surrounding the
2
old Brandberg West Mine had become folded
3
and concertinaed by enormous horizontal pressures.
4
No error