Automobile-production in the US-
A
have taken stupms and rises in recent years
B
has been rather erratic recreation
C
has been erratically letely
D
are going up and down all that time
Correct Answer: has been rather erratic recreation
এখানে Subject হলো production যা singular subject তাইverb হবে singular হবে। অপশন b & c তে singular verb থাকলেও C তে be verb এর পরadverb থাকায় এটি ভুল। কারন be linking verb। তাই অপশন b সঠিক।