为什么选B,am calling 不选 called

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为什么选B,am calling 不选 called
Hello,Mary!This is John.You must know why I ______ you.
—Oh,hello,John!I’ve waited for this call since last month.
A.called B.am calling C.was calling D.have called

玛利亚!你必须知道我为什么给你打电话.
哦,约翰!我从上个月就等你的电话了.
他们是正在打电话,肯定用现在进行时的形式be doing

为什么选B,am calling 不选 called I am calling 110 for help now.for不是介词吗?为什么help不加ing? 第六题,A.call B.called C.calling D.calls come on!Do you know the boy _____ Li Ming?A.called B.calling I have agood friend( )Bob.A.call B.calls C.calling D.called I have a good friend_______Li Ming.A called B calling C call Thank you for your(.)A.call.B.called.C.calling.D.to call理由 The letter is from a girl （）Lucy.A.called B.calling C.calls Do you know the boy __Tom?A.call B.called C.calling D.calls 为什么不选B 为什么不选B? calls ,made ,called ,calling的意思