1.I will wait ( )he comes back,because I have something to tell him.A until B before C when D while 2.What ( )exciting news it is Is ( )new true?Aan,the B an ,a C /,the D / ,a

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1.I will wait ( )he comes back,because I have something to tell him.A until B before C when D while 2.What ( )exciting news it is Is ( )new true?Aan,the B an ,a C /,the D / ,a

1.I will wait ( )he comes back,because I have something to tell him.A until B before C when D while 2.What ( )exciting news it is Is ( )new true?Aan,the B an ,a C /,the D / ,a
1.I will wait ( )he comes back,because I have something to tell him.
A until B before C when D while
2.What ( )exciting news it is Is ( )new true?
Aan,the B an ,a C /,the D / ,a

1.I will wait ( )he comes back,because I have something to tell him.A until B before C when D while 2.What ( )exciting news it is Is ( )new true?Aan,the B an ,a C /,the D / ,a
1.A until直到…… 不选when,是因为when he comes back,表示当他回来的时候,是一个时间点,这样的话,就不能用I will wait ,而是I am waiting when he comes back.需用现在进行时.
2.C news是不可数名词,所以不能用a/an

1A 直到。。。才。。。
2 C news不可数

ba