皮皮学，免费搜题
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【单选题】
杂交育种依据的遗传学原理是（ ）A.
染色体变异
B.
基因连锁互换
C.
基因自由组合
D.
基因突变
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知识点：
皮皮学刷刷变学霸
举一反三
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to prevent
B.
preventing
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D.
prevented
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A.
did he say
B.
him saying that
C.
he said
D.
will he say
【单选题】What do you imagine___to him just now?
A.
happening
B.
to happen
C.
happened
D.
had happened
【单选题】What do you imagine to her after this event?
A.
happen
B.
happened
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happens
D.
to happen
【单选题】What do you imagine ___ to him just now?
A.
happening
B.
has happened
C.
happened
D.
had happened
【单选题】What do you imagine _____ to her ?
A.
happening
B.
having happened
C.
has happened
D.
to have happened
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