is this hovercraft____made its first public flight in 1959?a.that b.which c.the one that d.the one为什么是c?

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isthishovercraft____madeitsfirstpublicflightin1959?a.thatb.whichc.theonethatd.theone为什么是c?isthishove

is this hovercraft____made its first public flight in 1959?a.that b.which c.the one that d.the one为什么是c?
is this hovercraft____made its first public flight in 1959?
a.that b.which c.the one that d.the one
为什么是c?

is this hovercraft____made its first public flight in 1959?a.that b.which c.the one that d.the one为什么是c?
这是定语从句,可还原为this hovercraft is the one that made its first public flight in 1959.
hovercraft是先行词,前面加了this这个不定冠词,就必须用the one修饰,ONE后面引导词不能省略,一定要用that(这是要背出来的,定理）；
如果this改成the,就选A
这么清楚的解释,要加分啊

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