Question

Fill in the blank with the most appropriate word.
A: I've been working a lot on my computer these days.
B: Oh, really? ________ you had a computer.

• A. I haven't known
• B. I hadn't known
• C. I didn't know
• D. I don't know

Answer 1

The correct option is C I didn't know

Since the question is about an action that happened in future, but continued to the present, the answer should imply a general response about an expression that was valid only in the past. Hence simple past tense should be used, and option C is correct. The rest of the options do not adhere to this rule, hence incorrect.