问题描述：
1.Mary has just left,but I didn't know she( ) until yesterday evening .(解释下为什么选B而不选C)
A will leave B was leaving C had left D has left
2.Have you sent for a doctor?
Sorry,I ( ) all about it(解释下为什么选C而不选A)
A had forgotten B will forget C forgot D forget
A will leave B was leaving C had left D has left
2.Have you sent for a doctor?
Sorry,I ( ) all about it(解释下为什么选C而不选A)
A had forgotten B will forget C forgot D forget
问题解答：
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