贷记凭证的有效期应为自签发日起()。
A、3天
B、5天
C、7天
D、10天
参考答案:A
Here are the chairs for you to _____. [ ]
A. sit
B. be seated on
C. sit on
D. sit down
She may be slow, but she is honest.
A. at first
B. at most
C. at least
D. at once