单项选择题

There was nothing that they could do ______.

A．but wait
B．except waiting
C．only to wait
D．unless they wait
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单项选择题
—Have you found your pen yet—No, I am not sure ______ I could have done with it.
A．whether
B．where
C．when
D．what
单项选择题
For thirteen years after his return from Europe, ______.
A．the Chicago Daily News was worked for by Carl Sandburg
B．Carl Sandburg’s work for the Chicago Daily News
C．when Carl Sandburg worked in Chicago for the Daily News
D．Carl Sandburg worked for the Chicago Daily News
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