单项选择题

_________ by his friend for his mistake, Jim felt very unhappy.

A．Criticizing
B．To criticize
C．Criticized
D．Having criticized
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单项选择题
The visitors felt greatly surprised at_________ they saw in the museum.
A．who
B．whose
C．how
D．what
单项选择题
By the end of this month, we surely ______ a satisfactory solution to the problem.
A．have found
B．will be finding
C．will have found
D．are finding
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