_____ about the safety of her son, John’

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问题选择题

_____ about the safety of her son, John’s mother looked upset．

A．Concerning

B．Concerned

C．To concern

D．Concern

答案

答案：B

考查固定短语。人担心什么，通常用sb. be concerned about …的结构，该短语是被动语态结构，已经形容词化。所以选B。

选择题

If ______ in wet sand, the vegetables can ______ fresh for a long time.

A．being buried; remain

B．buried; remain

C．buried; be remained

D．burying; remain

单项选择题

执行“自由变换”“旋转”时，加按Shift键，限定每旋转一次相对增加（）度。

A.15

B.30

C.45

D.60