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英语的语法不太会~···

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英语的语法不太会~···
1.Juan……………..in the library this morning.a) is study b) studying c) is studying d) are studying
2.Alicia,…………the windows please.It’s too hot in here.
a) opens b) open c) opened d) will opened
3.Her …………………………..very heavy.
a) luggage is b) luggage are c) luggage are d) luggages is
1.c
2.b
3.a
主要解释一下(1):Juan is studying in the library this morning.
如果理解为this morning是过去的时间的话,用is studying就前后矛盾了,时态不统一.
因此可以理解为:It is still in the morning,and Juan is still studying.
即说这句话的时间仍然是in the morning,并且Juan仍然在studying.这么理解就通顺了.