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lsat题,ron washed a total of seven objects after eating his l

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lsat题,
ron washed a total of seven objects after eating his lunch.Two of the objects were pieces of china:a mug and a plate.two were piees of glassware:a water glass and a juice glass.three were utensils:a fork,a knife,and a spoon.ron washed the two pieces of china consecutively,the two glasses consecutively,and the t:
he washed each of the objects exactly once.
he washed the glassware after either the china or the utensils but not after both.
he washed the knife before the spoon,and he washed the mug before the plate.
he did not wash any two objects at the same time.
if ron washed the spoon immediately before the fork,then which one of the following statements can be true?
a.he washed the knife second.
b.he washed the knife third.
c.he washed the plate third.
d.he wahshed the plated sixth.
e.he washed the plate seventh.
我选的是b,但正确答案是e.为什么呢?
lsat题,ron washed a total of seven objects after eating his l
答案就是E
有下列四种情况:
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