＿＿＿＿＿box cannot be lifted by a boy of five. A. So a heavyB. So heavy a C. A such heavyD. S

问题补充：

＿＿＿＿＿box cannot be lifted by a boy of five.

A. So a heavy

B. So heavy a

C. A such heavy

D. Such heavy a

答案：

A. So a heavy

(答案→)B. So heavy a

C. A such heavy

D. Such heavy a

解析：表示“如此重的箱子”可以用“so heavy a box”或“such a heavy box”。