单项选择题

Had he worked harder, he _____ the exams.
A must have got through
B would have got through
C would get through
D could get through

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要使平行光管出射的光是平行光，狭缝应在会聚透镜的焦平面上

答案：正确

多项选择题

灌木可分为：
A、观花植物
B、观果植物
C、观枝干植物
D、观茎植物