--Mike,have you ever heard of the latest water heater using solar energy?---Yes,of course,but I haven’t decided whether to buy_________.A.it B.one C.this D.that

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--Mike,haveyoueverheardofthelatestwaterheaterusingsolarenergy?---Yes,ofcourse,butIhaven’tdecidedwhet

--Mike,have you ever heard of the latest water heater using solar energy?---Yes,of course,but I haven’t decided whether to buy_________.A.it B.one C.this D.that
--Mike,have you ever heard of the latest water heater using solar energy?---Yes,of course,but I haven’t decided whether to buy_________.A.it B.one C.this D.that

--Mike,have you ever heard of the latest water heater using solar energy?---Yes,of course,but I haven’t decided whether to buy_________.A.it B.one C.this D.that
B 同类不同物

B

B
it this that 都指的具体的一个东西
one 只是说买一个,不是说具体的哪一个