题目
—Thanks god!Meng Wanzhou has successfully returned to China.
—You can\’t imagine how much difficulty China had ________ the problem.（ ）
—You can\’t imagine how much difficulty China had ________ the problem.（ ）
A.
solve
B.
to solve
C.
solving
D.
solved
知识点：代词辨析章节：词法 / 代词