Question

— 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.

Answer 1

：C

：此題重點(diǎn)考查賓語(yǔ)從句的時(shí)態(tài)和語(yǔ)序問(wèn)題，無(wú)論哪種句式結(jié)構(gòu)充當(dāng)賓語(yǔ)從句都要用陳述句語(yǔ)序，從句的時(shí)態(tài)要和主句的時(shí)態(tài)保持一致。因主句的謂語(yǔ)動(dòng)詞是過(guò)去式從句的謂語(yǔ)動(dòng)詞也要用相應(yīng)的過(guò)去時(shí)態(tài)。