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请教语法
1.Although the many hours of summer sunshine in Canada's Klondike region produce good vegetable crop, the long winters rarely permit ( ). a,grain crops ripen b,grain crops are ripen c,the ripening of grain crops d,to ripen grain crops
答案是C,我的问题是D为什么不对呢?
2.(A )computer program that communicates with (the user) solely by (chances providing) from the interlined menus (is said) to be menu-driven.
谢谢大家!
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