smog can also make it difficult for some people____A breathingB to be breathedC breatheD to breathe
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smog can also make it difficult for some people____
A breathing
B to be breathed
C breathe
D to breathe
D
选D吧
D
it是形式宾语,真正的宾语是to breathe
这里的情形类似于be difficult for sb. to do sth.
difficult、easy、hard、light、heavy等词后面的不定式都只能用to do,不能用to be done. 比如:The box is too heavy to carry.(这个箱子太重,提不起)这里的to carr...
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D
it是形式宾语,真正的宾语是to breathe
这里的情形类似于be difficult for sb. to do sth.
difficult、easy、hard、light、heavy等词后面的不定式都只能用to do,不能用to be done. 比如:The box is too heavy to carry.(这个箱子太重,提不起)这里的to carry就不能用to be carried代替。
收起
D
smog can also make it difficult for some people____A breathingB to be breathedC breatheD to breathe
mak
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