问题

Many people believe we will face serious problems ______we take action to change the way we live.

A:but
B:though
C:unless
D:until;

正确答案是：

同类题型

The lab ________ construction will be completed next month

She __________ have left school, for her bike is stillhere.

She fully____ the humor of her role in the play and made it a great success.

下列句子中加点词语的解释，不正确的一项是(　　)

You should wear a shirt with long sleeves _________ you get burnt in the sun.