单项选择题

______ I admit that the problems are difficult, I don't agree that they can't be solved.

A．Suppose
B．Because
C．While
D．Until
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单项选择题
Thank you for your invitation. I am looking forward to ______ your hometown.
A．visiting
B．being visited
C．visit
D．visiting at
单项选择题
______ should any worry be given to a small child.
A．On no account
B．Of no account
C．From all accounts
D．On account of
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