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.
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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
单项选择题
Silver is the best conductor of electricity, copper ______ it closely.
A．followed
B．following
C．to follow
D．being followed
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