— The teacher asked us ________________
A. What the bad effect of pollution are.
B. What were the bad effect of pollution.
C. What the bad effect of pollution were.
：C
：此題重點考查賓語從句的時態(tài)和語序問題，無論哪種句式結(jié)構(gòu)充當賓語從句都要用陳述句語序，從句的時態(tài)要和主句的時態(tài)保持一致。因主句的謂語動詞是過去式從句的謂語動詞也要用相應(yīng)的過去時態(tài)。
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