Topic: Sequence of Tense,

Best Answer Explained in Below-:

The sentence "It was not long since I — her last." requires a verb that properly fits the context of a completed action that recently occurred. The phrase "not long since" indicates that the action took place in the past but is still relevant to the present moment.

Option A, "see," is in the present tense and does not fit the past context. Option C, "has seen," is in the present perfect tense, which suggests an action that occurred at an unspecified time before now, rather than a specific, completed action in the past. Option D, "have seen," is also in the present perfect tense like option C, making it an unsuitable choice.

Option B, "saw," is the simple past tense, which is appropriate for indicating that the action of seeing took place at a specific moment in the past, aligning perfectly with the time frame implied by "not long since." Thus, the sentence reads correctly as "It was not long since I saw her last," clearly expressing that the speaker last saw her in the recent past.