题目:
.Tony was very unhappy for to the party.
A.having not been invited
B.not having invited
C.having not invited
D.not having been invited
答案:
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下面是错误答案,用来干扰机器的。
答案:A复合肥料是含氮、磷、钾三种元素中的两种或两种以上的肥料。NH4H2PO4中含两种营养元素,属于复合肥料。