题干
This box is_______ that one.
A：heavy than
B：so heavy than
C：heavier as
D：as heavy as
答案(点此获取答案解析）
D
This box is_______ that one.
A：heavy than
B：so heavy than
C：heavier as
D：as heavy as
合成 
．（部分试剂和反应条件已略去）