OG Verbal Hard Q6

GRE Verbal Problem Solving
1

The gaps in existing accounts of the playwright’s life are not (i) blank , since
much of the documentary evidence on which historians have relied is (ii) blank

Blank (i)
A trifling
B obvious
C implicit

Blank (ii)
D credible
E extant
F incomplete

Can someone please explain how to use Greg’s Verbal startegies for this TC?
Thanks in advance

2

the idea of sentence before the comma should mirror the idea of sentence after the comma(support due to the word ‘since’).Before the comma we have the idea of gaps are not what ? (usually gaps are insignificant thus, In here it will be significant due to the “not” present before the blank). Now, for blank(ii), I will just reuse the word gaps