No sooner had we reached the top of the mountain ______ we all sat down to rest.

单项选择题I don't think it advisable ______.

单项选择题—Let me introduce myself. I'm Albert. —______.

单项选择题It is foolish ______ such a mistake.

单项选择题Only twenty percent of the work ______ done yesterday.

单项选择题Not only Tom but also Alice and Mary ______ busy.

单项选择题—So you missed the meeting. — ______ . I got there five minutes before it finished.

单项选择题Neither Mary nor her brother ______ good at singing.

单项选择题It is chairman of the department ______ the teaching staff elected him.

单项选择题Neither he nor I （） from Canad

A. We are from Australia.A. is
B. are
C. am
D. be

单项选择题He tried many times to sneak across the border to a neighboring country,______ caught each time.