题目:
She volleyball regularly for many years when she was young.
A.was playing
B.played
C.has played
D.had played
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:晨昏线过地心与阳光相垂直,由于太阳直射点的移动,故晨昏线只有在二分日时与经线重合,当晨昏线与极圈相切时,晨昏线与经线圈的夹角最大,为23°26'。点评:本题解题关键是掌握晨昏线的分布特...