169.Because the enemy’s new ship is the quietest and it is therefore the most elusive submarine, it is being increasingly viewed by the military as a threat to security.
(A) and it is therefore the most elusive submarine, it is being increasingly viewed
(B) it is therefore the most elusive of submarines, and it has increased the view
(C) and therefore the most elusive submarine, it is being increasingly viewed
(D) and therefore it is the most elusive of submarines, there is an increasing view
(E) therefore being the most elusive of submarines, it is increasingly viewed
答案是C...請問一下這邊being的用法為何?大家考試遇到什麼情形,才會將being選得下手呢?