问题

He was about to leave the office for home _______someone knocked the door and asked for some help.

A:until
B:while
C:as
D:when;

正确答案是：

同类题型

The production of the factory has grown to _____ in1999.

8, Joseph Banks was elected ______ president of theRoyal Society, ______ position he held for 42 years

Our bodies are strengthened by taking exercise ________，our minds are developed by learning

下列各句中,没有语病的一句是

One day, when I was walking in the street, someone dropped a pie from a window above, and it _______ missed landing on my head