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2道英语题目On returning from school,____________A,I found a lette

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2道英语题目
On returning from school,____________
A,I found a letter in the mail box B,a letter was in the mailbox
C,a letter was found in the mailbox D,the mail box had a letter in it
To work efficiently,_______-
A,it is necessary to clean and check your watch regularly
B,you must have your watch cleaned and checked regularly
C,your watch must be cleaned and checked regularly
D,you must clean and check your watch regularly
要写为什么!!!!!!
2道英语题目On returning from school,____________A,I found a lette
(While/When i was )on returning the school这个从句中主语是我,所以主句中应该以我为主语.所以选A
to work efficiently= if you want your watch to work efficiently,you must have your watch怎样怎样=your watch must be 怎样怎样.所以选C