June 2010: International

f1kecy778591
Wed, 09 Jun 2010 08:04:21 +0000

I eliminated A coz it is easily seen that there is no verb in that sentence.
forgot the rest sentences coz they are easily eliminated

the two remaining are
B: Two types of the hydrocarbons are the simple carb identified by…, and the complex carb which is…
D: Of the two types of hydrocarbons, there is the simple carb identified by…, and the complex carb which is…

i chose B

for the sisters, i remember sth like A (: