【題目】---How long has the country been open to international trade? ---____________1978, I think.

A. AfterB. BeforeC. InD. Since

【答案】D

【解析】

句意:——這個國家國際貿(mào)易開放了多長時(shí)間?——我認(rèn)為自從1978年。After…..之后,before……之前,in表示將要多久,since表示自從。根據(jù)has the country been open to可知與現(xiàn)在完成時(shí)連用,故用since引導(dǎo)時(shí)間狀語。故選D

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