单项选择题

The children went there to watch the iron tower ______.

A．to erect
B．be erected
C．erecting
D．being erected
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单项选择题
I know nothing about him ______ he is an engineer.
A．only
B．except for
C．besides
D．except that
单项选择题
Since then I ______ the mail.
A．am expecting
B．expected
C．was expecting
D．have been expecting
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