单项选择题

What’ s troubling them is______ enough machine tools.

A．their not to have
B．them to not have
C．their not having
D．not their having
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单项选择题
Movies used to be shown in an open space in our town, with audience______on benches, chairs or boxes.
A．seating
B．to seat
C．seated
D．being seated
单项选择题
______ experiments on the laboratory, it started to rain heavily.
A．While performing
B．Performing
C．While I was performing
D．To perform
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