Chose C. But,
Isnt "Digging in sediments in northern China" - a verb modifier, thus need not be followed by "who is doing the digging". Because verb modifier do not follow the touch rule of noun modifier.
A and B - can be eliminated for using "Past Perfect" - had.
D - that which was - incorrect
E - that is used with noun and pronoun.
Isnt "Digging in sediments in northern China" - a verb modifier, thus need not be followed by "who is doing the digging". Because verb modifier do not follow the touch rule of noun modifier.
A and B - can be eliminated for using "Past Perfect" - had.
D - that which was - incorrect
E - that is used with noun and pronoun.
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