Question

The teacher asked us ______.

1. A.
   What the bad effect of pollution are
2. B.
   What were the bad effect of pollution
3. C.
   What the bad effect of pollution were

Answer 1

C
：此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。因主句的谓语动词是过去式从句的谓语动词也要用相应的过去时态。