问题

Mark needs to learn Chinese ______ his company is opening a branch in Beijing.

A:unless
B:until
C:although
D:since

正确答案是：

同类题型

It was not until midnight _______ they reached the camp site.

London is a most beautiful city in Britain, ____ the River Thames

下列各句中，没有语病的一句是（）

________about the result of the experiment，he still wants to give it a try．

Most of the people _______to the party werefamous scientists