问题

.He was about to leave ______the telephone rang; ______was from his mother.
A:when; that
B:before; which
C:when; it
D:before; this
B:before; which
C:when; it
D:before; this
正确答案是:
同类题型
The doctor advised Elsa strongly that she should have a rest, but ___ didn’t help.
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Can you understand what I mean? — Sorry, I can ______ follow you.