单项选择题
I don’t understand ______ he should have done something like that.
- A．why
B．what
C．how
D．when
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They took ______ measures to prevent poisonous gases from escaping in the chemical plant.
A．influential
B．beneficial
C．fruitful
D．effective -
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They haven’t decided ______ the microscope themselves or buy one from the United States.
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C．either to build
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The old man came upstairs with great efforts, his right hand ______ a stick for support.
A．having held
B．held
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