问题

It was about 600 years ago _______ the first clock with a face and an hour hand was made.

A:that
B:until
C:before
D:when

正确答案是：

同类题型

scovery of the oil field, to the delight of thewhole nation, will largely _______ the country’s dependence on imports ofenergy

You may arrive in Beijing early _____ youmind taking the night train

Seeing the ______ sight, the girl was nearly _______ to death.

Honestly speaking, I would agree with Cathy, though not __________.

、Tom is a very person and we are in his jokes.