单项选择 适中0.65 引用1 组卷107
A beam of light will not bend(弯曲)round corners unless____ to do so with the help of a reflecting device(反射装置)。
A.made | B.being made | C.having made | D.to be made |
19-20高二上·广东江门·期中
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—I hear John was badly injured in the accident.
—________, let’s go and see him.
—________, let’s go and see him.
A.If not | B.If so |
C.If necessary | D.If possible |
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