【題目】I couldn’t work out this problem ________ my teacher helped me.

A. before B. unless C. because D. until

【答案】D

【解析】

試題分析:句意:直到老師幫助了我我才解答出這道題。根據(jù)句意及題干分析此題考查not...until結(jié)構(gòu),是直到…………的意思,故選D。

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