问题

Unless______ to speak, you should remain silent at the conference.

A:invited
B:inviting
C:being invited
D:having invited

正确答案是：

同类题型

_______you’ve got a precious chance, you might as well make full use of it[ ]

_________ going to the exhibition

Mr Smith Shanghai next week.

下列各句中，没有语病的一句是

What’s the weather like _______ winter— It’s _____.