单项选择题

Mary will not be able to come to the birthday party as she is ______ with a cold.

A. laid out
B. laid up
C. laid by
D. laid down
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单项选择题
To make this ______ clear we shall have to look closely into biology's long history.
A. distinction
B. indication
C. recognition
D. constitution
单项选择题
She often says her greatest happiness ______ serving the handicapped children.
A. relies on
B. consists in
C. composes of
D. comprises in
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