The manager ordered the work __________.
A. be started at once
B. to be started at once
C. to start at once
D. at once started
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The missing boys were last seen _________ near the bank.
A. playing
B. to be playing
C. play
D. to play
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
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