单项选择题

What happens when sea water touches different elements（）another subject of study.

A、 are
B、 is
C、 have been
D、 was

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单项选择题
In addition, teaching staff is willing （）extra help if a student needs.

A、 providing
B、 provide
C、 provides
D、 provided
单项选择题
（）, his work is of great value than mine.

A、 All things considered
B、 Considering all things
C、 Considered all things
D、 All things considering
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