问题

It’s difficult _____ your sound because the noise is too high.
A:to listen
B:to know
C:to learn
D:to hear
B:to know
C:to learn
D:to hear
正确答案是:
同类题型
Please ________ as soon as you get up.
Zhang Yimou is not in China. He has gone .
The reserve gives wildlife food and shelter. Which is the correct sentence structure?
_____can work out the problems because _____of the problems is easy.
I’m allowed to go out with my friends on Friday nights.— ________________.