单项选择题

The river was______ with waste from that factory. Some measures must be taken to stop its production.

A．corrupted
B．consumed
C．contaminated
D．infected
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单项选择题
He always tries his best to complete it on time.
A．However the task is.
B．However hard the task is.
C．Though hard the task is.
D．Though hard is the task.
单项选择题
He's______ as a bellyacher -- he' s always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
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