Therearethreemainclassesofdrug

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There are three main classes of drugs, ________ has a different effect on the body.

A．each of them	B．all of them
C．each of which	D．all of which

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A．even if

B．as if

C．so that

D．provided that

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all kinds of difficulties，the workers have made rapid progress in the construction of
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A．With

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—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！Ifor it．But I haven’t decided when to do it．

A．have prepared	B．had prepared
C．have been preparing	D．was preparing

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a diary every day and you’ll improve your writing．

A．Keeping

B．To keep

C．Keep

D．If you keep

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If we had taken such effective measures much earlier, the riverso seriously now.

A．is not polluted	B．would not be polluted
C．had not been polluted	D．would not have been polluted

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