Refer the Manhattan GMAT SC guide-Page 55, Example 2

Why did you not use present perfect? Is is wrong to use present perfect instead of present perfect continuous?
When should we use Present Perfect Vs Present perfect continuous?
Thanks

Can you please explain the usage of Present Participle( Preparing ), Past Participle (Prepared) and Present Perfect Participle(Having prepared)?
Thanks in advance

hello:

please copy the text of the problem and the given answer.

we instructors don't always have our guides handy while we're answering problems, also, more importantly, the thread is useless to other students unless the question is posted on it.

thanks.

Manhattan SC Guide
Q- We are walking all over the countrysidesince last weekend
Correct ans -We have been walking all over the countryside since last weekend.
Why is the correct ans in present perfect continous and not present perfect
Is We have walked all over the countryside since last weekend wrong?
Thanks

Have walked would be fine too - it was just kept in continuous because the original sentence said "are walking." The test won't make you make a distinction on such things unless there's some reason why only one tense is right and all of the other options are wrong (that is, they won't give you two options that could both be right - notice that you didn't actually have multiple choice answers from which to choose for this question).

Adding the "Been" does this make is passive voice?

nope. passive voice always uses PAST participles, not present participles (which are a hallmark of the active voice in the progressive tenses).

examples:
we have been tricking people --> active voice (note the present participle); we're the ones doing the tricking
we have been tricked --> passive voice (note the past participle); we're the victims of the tricking