【題目】－There lots of wolves in this forest, but now they are endangered.

－Yes. Something must be done to protect them.

A. used to have B. is used to have C. is used to be D. used to be

【答案】D

【解析】

句意：——以前森林里有很多狼，但現(xiàn)在它們?yōu)l臨滅絕�！堑�，必須采取措施保護(hù)他們。這里是there be句型的過去式，其結(jié)構(gòu)是there used to be+主語+介詞短語；used to be表示過去常�！瓨�，根據(jù)題意，故選D。

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