单项选择题

In selecting a material, the engineer’s interest is in its properties which determine how it will perform under the loads and condition ________ it is subject.

A．where
B．which
C．in which
D．to which
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单项选择题
The mother almost ________ when she learned that her son was shot dead.
A．fell down
B．came down
C．fell apart
D．went to pieces
单项选择题
They ________ the park of late.
A．will visit
B．have visited
C．are visiting
D．visited
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