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  • 3 months later...
Because uranium is the heaviest, and it is therefore the most penetrating, of natural metals, it is being increasingly used in the production of armor piercing bullets and rockets.

 

(A) and it is therefore the most penetrating, of natural metals, it is being incre uingly used

(B) and it is therefore the most penetrating, of natural metals, it has increased use

© and, therefore the most penetrating, of natural metals, it is being increasingly used

(D) and therefore it is the most penetrating of natural metals, there is increasing use

(E) therefore the most penetrating of natural metals, it is being increasingly used

 

couldnt choose btn C and E

 

Looking for a good explanation....

 

When to use "most penetrating, of natural metals" and when to use "most penetrating of natural metals"... i.e. without comma...

 

Also the minute differences among:

 

Because A is this..., and it is therefore...

Because A is this..., and therefore it is...

Because A is this..., therefore the most...

 

When 'and' is reqd and when 'it is' required in the clause - "and, therefore the most penetrating..." etc...

 

Thanks...

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