Sky Airlines ___ safety standards were considered so poor that its planes were banned in Europe in 2002
PART III. VOCABULARY - GRAMMAR
I. Circle the best option A, B, C, or D to complete the following sentences.
26. Sky Airlines ___ safety standards were considered so poor that its planes were banned in Europe in 2002 has improved greatly in recent years.
A. who
B. whom
C. whose
D. whoever