题目

阅读理解A rare wild flower is being re﹣established in Devon fields thanks to some four﹣legged helpers. A conservation charity called Plantlife has employeddonkeys as ecosystem engineers to encourage the return of theendangered small﹣flowered catchfly. The catchfly was once found all across Britain but now it only grows insmall areas of Wales and the south and west of England. Experts blame itsdecline on modern farming practices. The flower flourished around the edges ofsandy fields where farmers grew their crops, but because of weedkillers thatwere used to remove unwanted plants, andHe___________ his grandparents in the countryside last week.A. visits B. visit C. visited