(That) the country is now politically stable and economically robust (and will) almost certainly continue (to do so) (is) no longer seriously doubted.
Answer: error in in c- to do so.
Any explanations?
The sentence should have “to be so” in place of “to do so.” Something that is and continues, continues to be not to do.
I second @CHD2013 - being political stable and economically robust is a description of a thing, not an action that something is doing, and therefore the country will continue being so, not doing so.
Ahh yes. Very good- thanks!
What about this one:
The quality of multivitamin tablets (is determined) by (how long) (its) potency (can be protected) by the manufacturer’s coating material.
Answer is c
multivitamin tablets is a plural term, so the correct pronoun is their