问题
选择题
Jenny was very sad over the loss of the photos she had shot at Canada, ____ this was a memory she
especially treasured.
A．as
B．if
C．when
D．where
答案
答案：A
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Jenny was very sad over the loss of the photos she had shot at Canada, ____ this was a memory she
especially treasured.
A．as
B．if
C．when
D．where
答案：A
＝4m/s2。试分析：两车相遇几次？何时相遇？