1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)的值是( )
A.3
B.4
C.1
D.5
参考答案:A
—Jim, ________ you answer the last question?
-- Sorry, I can’t. It’s too hard.
A.need
B.may
C.must
D.can
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