单项选择题

It's now possible to record the existence of many stars which are ______ invisible.

A．hardly
B．heavily
C．permanently
D．thereby
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单项选择题
______ he is a well learned surgeon but he cannot even perform a minor operation.
A．Clearly
B．Actually
C．Technically
D．Apparently
单项选择题
Alex Haley was ______ unheard of until he wrote the novel Roots.
A．truly
B．roughly
C．genuinely
D．practically
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