题干
There is nothing ambiguous ___ all illegal immigrants should be sent back across the border immediately.
A：that
B：which
C：whether
D：when
答案(点此获取答案解析）
A
There is nothing ambiguous ___ all illegal immigrants should be sent back across the border immediately.
A：that
B：which
C：whether
D：when
，若
存在零点，则实数
的取值范围是( )