单项选择题

At the later stage of development, there ______new problems which first seemed insoluble.

A．rose
B．arose
C．resulted
D．happened
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单项选择题
Some of the students are especially______ about making mistakes.
A．sensible
B．sensitive
C．senseless
D．insensible
单项选择题
Mack Twiller, my friend's husband, ______brought up and educated in Europe, lived at lecture in Australia most of his life.
A．if
B．when
C．though
D．who
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