Stop!Youcannevertouchthismachi

Stop! You can never touch this machine when it ________, it is very dangerous.

A．has been operated

B．will be operated

C．is operated

D．is being operated

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A．With; developing	B．Under; development
C．With; development	D．Under; developing

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A．out

B．beside

C．over

D．Beyond

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A．upon; on

B．on; in

C．on; for

D．at; to

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41. During her study in Massachusetts Institute of Technology she has got the degree _____ PhD, and it is a degree ______ chemistry.

A．of; at

B．in; at

C．of; in

D．in; of

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A．on

B．about

C．for

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