问题
Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.
A:make
B:to make
C:made
D:making
B:to make
C:made
D:making
正确答案是：
同类题型
How many students are there in theclassroom–__________. They are all in the lab.
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A new study suggests that yelling at children may have consequences that go beyond of beating them.
In winter people usually keep flowers in their houses to them from the cold weather.