问题

Among the 15-year-old children, some ____ studying in university while others are still learning to read and write.

A: should have been
B: would have been
C: can be
D: must be

正确答案是：

同类题型

Did you listen to the program yesterday—Yes. I can’t believe I heard her singing ______ the radio.

Mary, what did our monitor say just now—Every boy and every girl, as well as teachers who ______ to visit the museum, _____ asked to be at the school gate before 8:30 in the morning.

There _______ a Chinese book and two maths books on the desk.

It all depends on _______ you can speak Spanish fluently.

I wasn’t aware of this before, but recent research _____ that eating too much fat can contribute to heart disease