问题

use water to put out the fire if oil catchesfire As is known, oil ____ float on water

A:Am ;are
B:Is ; are
C:Are;are
D:Is; is

正确答案是：

同类题型

下列各句中加横线的成语使用错误的一项是（）

________ up with others, we’d better preview the schoolwork in advance and work very hard.

It’s the first time ______ he has helped us

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