题目内容

Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their

A. is
B. are
C. that is
D. those are

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A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind.

A. to have been studied
B. to be studied
C. having been studied
D. being studied

狗的尾巴还能表达感情呢。它一见主人，尾巴就会yao个不停。

These differences should not hinder us from establishing normal state relations; still less______war.

A. they should lead to
B. leading to
C. lead to
D. should they lead to

You______ more patient with that customer; I am sure that selling him the watch was a possibility.

A. should have been
B. should be
C. must be
D. needed to be