这个问题表面上似乎无法解决，但她找到了一个巧妙的解决方案。

The problem was ___seemingly impossible to solve, but she found an ingenious solution.

他为缺席会议提供了一个表面上完美的借口。

He gave a ___seemingly perfect excuse for his absence from the meeting.

谈判以表面上友好的交流开始，后来却演变成了激烈的争论。

The negotiation began with ___seemingly friendly exchanges, which later turned into heated arguments.