问题

It takes Jack ______ hour to practice playing _______ volleyball every day.
A:a; /
B:an; the
C:an; /
D:a; an;
B:an; the
C:an; /
D:a; an;
正确答案是:
同类题型
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Tina, I want to have a pet. How about a dog— I prefer a cat. It is ______ to take care of.