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【单选题】
等腰三角形、等边三角形、直角三角形等都是三角形的（）A.
反例
B.
变式
C.
概括
D.
抽象
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反馈参考答案：
举一反三
【单选题】---Hi! Long time no see. ---Yes. It’s almost three years_____ we met last time.
A.
while
B.
before
C.
since
D.
until
【简答题】It is almost five years ______ we saw each other last time. A．before B．since C．that D．when
【单选题】It’s almost eight years we saw each other last time.
A.
since
B.
before
C.
after
D.
when
【单选题】---Good to see you again. It’s almost three years _______ we met last time. ---Yes, how time flies.
A.
until
B.
before
C.
while
D.
since
【单选题】It is almost five years_______ we saw each other last time.
A.
before
B.
since
C.
for
D.
when
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