What _____ Kathy fell and hurt her knee?

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问题选择题

What _____ Kathy fell and hurt her knee? [ ]

A. weather

B. whether

C. through

D. if

答案

答案：D

单项选择题

He had studied hard , he would have been able to pass the exam.

A．He had studied harder

B．If only he studied more

C．Had he studied harder

D．When he studied more

多项选择题

下列植物属于含有生氰糖苷的食源性植物的有（）等。

A、木薯

B、杏仁

C、枇杷

D、豆类