问题
选择题
.It is often said that an American starts speech with a joke, __ a Japanese has an apology to make.
A．as
B．when
C．which
D．while
答案
答案：D
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.It is often said that an American starts speech with a joke, __ a Japanese has an apology to make.
A．as
B．when
C．which
D．while
答案：D