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Select the sentence that uses verb tenses correctly.
 
A. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance remained a mystery.

B. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance remains a mystery.
 
C. Although many theories are​ existing, the reason for Amelia​ Earhart's disappearance remains a mystery.

D. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance is remaining a mystery.

Respuesta :

7etrazzini
B, exist is present tense. so the person is speaking as though it's still occuring. therefore remains would fit since it is also present tense
sarkhan2018

The question concerns the correct use of although as a subordinate clause. In the options, subordinate clause deals with the truth or fact, i.e, theory here is a fact. Therefore, we have to use present simple in the subordinate clause. According to this result, we cannot use past simple in the main clause. So that, we are left with two options - B and D. As we mentioned, it is a fact that the theory exists, we cannot claim that it is continuing. Therefore, the main clause cannot be in present continuous. The correct option is B.