问题

Look at the boy running on theplayground. Is it David—It ______ be him. I saw him go to theteachers’ office just now.

A:mustn’t
B:can’t
C:couldn’t
D:must

正确答案是：

同类题型

Have you finished your work ______—Yes, I have. I’ve ______ finished it.

Would you mind_______ the time_______ watching drama series

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There _________ no flowers in the garden in winter.

September 10th is ______ Day.