1。 It is time （ ）break. A for B for a C to D to have 这题怎么做，为什么？

for a

是中途休息的时候了

it is time for + noun.

如果用have , 要用it is time to have a break

如果用for, 要用 it is time for a break

B

it's time to do sth.
it's time for sth.

it's time for a break.
it's time to have a break.

B for a

绝对正确

B 翻译为，是休息的时间了。

to have