问题

Weare watching TV ______ we caught sight of a friend of ours .
A:as soon as
B:while
C:when
D:once
B:while
C:when
D:once
正确答案是:
同类题型
My friend Amy _______ text messages to me on the mobile phone, but now she _______ e-mails on QQ.
right in the center of the city, the park attracts a lot of tourists.
getting dark earlier than before,isn’t it— Yes I think so I see ____ is onalready