"have thought" or "thought"

[Unregistered]

Dear teacher,
For a sentence like this" Since then, I __________ about Janpan a lot." Is "have thought " the only possible answer or I can use " thought" instead? Any difference between two answers?

[Raymott]

Dear teacher,
For a sentence like this" Since then, I __________ about Janpan a lot." Is "have thought " the only possible answer or I can use " thought" instead? Any difference between two answers?

"have thought". See any of the many recent discussions of the present perfect tense with adverbials of time.

[sarat_106]

Dear teacher,
For a sentence like this" Since then, I __________ about Janpan a lot." Is "have thought " the only possible answer or I can use " thought" instead? Any difference between two answers?

You have not stopped thinking about Japan, it must be going on now. So the present perfect 'have thought' will be more appropriate here.