题目内容

The missing boys were last seen _________ near the bank.

A. playing
B. to be playing
C. play
D. to play

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The visiting director expressed his satisfaction with the products, ____that he hadenjoyed his stay here.

A. having added
B. to add
C. adding
D. added

M.A. 的意思是（）。

A. 文学学士
B. 文学硕士
C. 文学博士

that all the risks should be calculated in advance.

A. This is necessary
B. Which is necessary
C. That is necessary
D. It is necessary

conscious 的意思是（）。

A. 明白的
B. 意识到的
C. 有思想的
D. 有经验的