单项选择题

He is a solemn person ______ temperament so it's extremely hard to make him smile, let alone ______.

A．by, laugh
B．with, laughing
C．through, to laugh
D．by, to laugh
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单项选择题
The surrounding shores were beautiful, almost uniformly clothed by ______ forest.
A．elementary
B．primeval
C．primary
D．primitive
单项选择题
I could help him with that, but I would sooner he ______ it by himself.
A．does
B．did
C．do
D．should do
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