Choose the best alternative to complete the sentence. A new house--- before I came.

সঠিক উত্তর: is being built
ব্যাখ্যা: "Is being built" is the correct tense (present continuous passive) to indicate that the action of building the house was ongoing before the speaker arrived.

ভুল অপশন ১: been built
ব্যাখ্যা: "Been built" suggests that the building process has already been completed, which is not suitable in this context where the process was still ongoing.

ভুল অপশন ২: is building
ব্যাখ্যা: "Is building" would require a subject (a person or entity building the house), but in this case, we need the passive construction to focus on the house itself.

ভুল অপশন ৩: building
ব্যাখ্যা: "Building" is incorrect here as it lacks an auxiliary verb, making it incomplete.