单项选择题

Problems with childcare remain the biggest _________ to women succeeding at work.

A．barrier
B．shortcoming
C．inconvenience
D．Prevention
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单项选择题
My mother was always asking questions, and it _________ me as odd that she didn't ask one on this occasion.
A．rubbed
B．hit
C．occurred
D．struck
单项选择题
_________ research is being done into the connection between the disease and poor living conditions.
A．Intensive
B．Expansive
C．Expensive
D．Extensive
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