问题描述:
英语18.To reach the top of the building ,you have to climb 18 _______ of _______.
18.To reach the top of the building ,you have to climb 18 _______ of _______.
a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair
为什么
18.To reach the top of the building ,you have to climb 18 _______ of _______.
a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair
为什么
问题解答:
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