电磁辐射对人体健康是否有影响?

【单选题】Some stude nts left the classroom because ___________.

A.

they were happy with the grade the teacher would give them

B.

they were allowed to take another easier exam later on

C.

they knew the teacher didn’t like them to take the test

D.

they thought the exam was so easy that they don’t need to have a try

【单选题】Some stude nts left the classroom because ___________.

A.

they were happy with the grade the teacher would give them

B.

they were allowed to take another easier exam later on

C.

they knew the teacher didn’t like them to take the test

D.

they thought the exam was so easy that they don’t need to have a try

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