急求高手解答几道初二英语题,急等!1.I don't know when Jim ______.I'll meet him at the airport when he ______.A.will return;return B.returns;will returnC.returned;returned D.will return;returns2.We must unders

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急求高手解答几道初二英语题,急等!
1.I don't know when Jim ______.I'll meet him at the airport when he ______.
A.will return;return B.returns;will return
C.returned;returned D.will return;returns
2.We must understand both t_____ and practise.
3.小麦可数吗?

1、D
因为JIM还没回来,所以用将来时,后半句中,主句用将来式从句用一般现在时,又因为是单三,所以要加s
2、training
3、不可数

肯定是D,A不对,he应该用三单
training
不可数

D,句意为我不知道Tom何时回来,表明他还没有回来,所以第一个空用将来时,第二句为主将丛现,意思就是如果主语用将来时,那么从句要与一般现在时

1A
2training
3不可数