Official Solution:
Although quite powerful in his time, the 16th century Russian czar Ivan the Terrible seems to us today as a remote and barely visible historical figure.
A. as
B. as though
C. as though to be
D. to be
E. as if
”to seem” can be used in any of the following ways:
1. As a linking verb (similar to the verb “to be”): It seems quite odd.
2. With an infinitive: You seem to be happy.
3. With “As though / As if + clause”: It seems as though / as if he will fall sick.
4. With “that” clause: It seems that he will fall sick.
A. “Seems as” is a wrong idiom. B. “Seems as though” needs a clause after “though” - “a remote and barely visible historical figure” is not a clause.
C. “Seems as though” needs a clause after “though” - “to be a remote and barely visible historical figure” is not a clause.
D. Correct: “Seems to be” is correct - the verb “seem” can be used with an infinitive.
E. “Seems as if” needs a clause after “if” - “a remote and barely visible historical figure” is not a clause.
Answer: D