题目内容

Since we have a focused subject， we should not talk ________.

A. at once
B. at hand
C. at intervals
D. at random

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The doctors are ________ about the guidelines under which they can carry out euthanasia.

A. at a stretch
B. at a loss
C. at random
D. at length

Basically，these attitudes amount to a belief ________ leisure can and should be put

A. which
B. that
C. what
D. how

________， he had no time to rest.

As he was tired
B. If he was tired
C. Tired as he was
D. Now that he was tired

There is the appreciation of the salient historical truth ________ the aging of advanced societies has been a sudden change.

A. which
B. what
C. that
D. how