单项选择题

Although customers keep complaining about their poor service, they've made no ______ to make any improvement.

A．action
B．trial
C．attempt
D．progress
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单项选择题
When I got out of the car and walked about among them, ______ one old man who shook his head disapprovingly, they all began to cheer.
A．see that
B．except that
C．provided that
D．except for
单项选择题
Evidence came up ______ specific sounds are recognized by babies as young as six months old.
A．what
B．that
C．which
D．whose
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