i think every family ______planes in 20 years.A.will has B.will have C.shall has D.shall have

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i think every family ______planes in 20 years.A.will has B.will have C.shall has D.shall have

i think every family ______planes in 20 years.A.will has B.will have C.shall has D.shall have
i think every family ______planes in 20 years.A.will has B.will have C.shall has D.shall have

i think every family ______planes in 20 years.A.will has B.will have C.shall has D.shall have
B 一般将来时.