which is the best1.New machinery __________ arriving tomorrow.[ ]a.will beb.isc.ared.shall be 为什么?

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which is the best1.New machinery __________ arriving tomorrow.[ ]a.will beb.isc.ared.shall be 为什么?
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which is the best1.New machinery __________ arriving tomorrow.[ ]a.will beb.isc.ared.shall be 为什么?
which is the best
1.New machinery __________ arriving tomorrow.[ ]
a.will be
b.is
c.are
d.shall be
为什么?

which is the best1.New machinery __________ arriving tomorrow.[ ]a.will beb.isc.ared.shall be 为什么?
选b"is".
这个语法现象是"用现在进行时表将来".排除a和d.
另外machinery是抽象名词,谓语动词用单数,排除c,所以选b.