题目内容

Lucy said she ____such a beautiful piece of music before.

A. hasn't heard
B. hadn't heard
C. doesn't hear
D. didn't hear

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I don't know if it tomorrow, If it ___, I'll not go fishing.

A. rains;rains
B. Rains;will rain
C. will rain; rains
D. will rain; will rain

They said that they ______ in a week.

A. will come back
B. would come back
C. come back
D. Came back

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抗代谢类抗肿瘤药分为哪些结构类型？各举一例药物。