单项选择题

Human beings ______ a lot to the birds and beasts who eat insects.

A．oblige
B．owe
C．thank
D．gratitude
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单项选择题
Have you seen Henry lately My boss wants to know ______ .
A．how he is getting along
B．how is he getting along
C．what he is getting along
D．what is he getting along
单项选择题
It worried her a bit ______ her hair was turning gray.
A．while
B．that
C．if
D．for
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