单项选择题

Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.

A．who
B．that
C．what
D．which
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单项选择题
I couldn't sleep last night because the tap in the bathroom was ______.
A．draining
B．dropping
C．spilling
D．dripping
单项选择题
______ as the census taker of the sky , Annie Jump Cannon contributed considerably to the field of astronomy.
A．Known
B．Knowing
C．To know
D．Knowledge
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