— Where is Tom?
— He is practicing _____ English _____ he can win the speech competition.
A:to speak; in order to
B:speaking; so that
C:speaking; in order to
D:to speak; so that
唐朝时,蔬菜品种日益丰富,市场上开始出现原产于地中海的莴苣、印度的刀豆、波棱国(今尼泊尔)的菠菜等。这种情况的出现得益于唐太宗( )