"You __ borrow my notes provided you take care of them," I told my friend.

A．could

B．should

C．must

D．can

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参考答案

【译文】我告诉朋友：“如果你妥善保管，我会把我的笔记借给你。”
情态动词的用法。provided引导条件状语从句，相当于if。主句表示“许可”，在口语中常用can，所以选D。

1 If only the patient __ a different treatment instead of using the antibiotics, he might still be alive now

A．had received

B．received

C．should receive

D．were receiving

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2 Linda was ___ the experiment a month ago, but she changed her mind at the last minute.

A．to start

B．to have started

C．to be starting

D．to have been starting

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3 She __ fifty or so when I first met her at the conference.

A．must be

B．had been

C．could be

D．must have been

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