7. A ________ can be used to solve algebraic and other math
questions.
(A) calendar
(B) cactus
(C) calligraphy
(D) calculator
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統計: A(28), B(17), C(34), D(753), E(0) #2927364
統計: A(28), B(17), C(34), D(753), E(0) #2927364