2. Our family make ______ a rule to visit our grandparents in the country once a month.
(A) that
(B) this
(C) it
(D) which
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統計: A(5), B(14), C(75), D(4), E(0) #1908537
統計: A(5), B(14), C(75), D(4), E(0) #1908537