Question

If ________ unsolved, this may lead to more serious problems．

[　　]

A．

making

B．

remained

C．

left

D．

taking

Answer 1

答案：C
解析：

补全为“If it is left unsolved,…”故选用过去分词表被动。

提示：

考查学生对非谓语动词及省略句的掌握情况。