问题描述：
3道英文选择题目 简单说下原因
1,_____ great help you have given me! A,what a B,what C,how a D,how 2,i didn”t know ————because it was dark. A,what was happening B,what happens C,happened what D,what was happened
1,_____ great help you have given me! A,what a B,what C,how a D,how 2,i didn”t know ————because it was dark. A,what was happening B,what happens C,happened what D,what was happened
问题解答：
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