问题

Only when class began _____ that he had left his book at home. [ ]

A: will he realize
B: he did realize
C: did he realize
D: should he realize

正确答案是：

同类题型

is Shenyang — It’s in the northeast of China.

_______ that he picked up French?— It was in 2010 _______ he traveled in France.

This CD-ROM can help you learn and have fun_____.

Don’t get off the bus __________ it stops.

Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.