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请高手回答以下题,7.I got a letter from my sister,me that she would v

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请高手回答以下题,
7.I got a letter from my sister,me that she would visit us next month.
A.tells B.told C.telling D.to tell
( ) 8.The problem is we don't have enough time.
A.it B.what C.that D.whether
( ) 9.Our concert turned out to be a great success,they had never expected.
A.what B.that C.when D.which
( ) 10.Although it is raining,continue working in the fields.
A.so they B.and they C.but they D.they
( ) 11.A pipeline will be built to some eastern provinces with natural gas from the west of China.
A.send B.supply C.sell D.offer
7.C (letter 是从句的主语,是物,所以用动词ing形式)
8.C (that 用来引导一个从句,而it和what都用作代词,这里没有用于指代的东西,whether 表选择,一般和or 连用)
9.D (宾语从句,要选择一个可以指代success的,是物,所以that和which 都行.而when表时间,what不能用于宾语从句)
10.D(有although,就不能有but,这是定理)
11.B(这个用意思分,只有supply是供给能源)