问题

There _____________ more trees if we all take care of our environment.
A:lay
B:has lain
C:laid
D:has laid;
B:has lain
C:laid
D:has laid;
正确答案是:
同类题型
In a courtroom it is sometimes difficult to ______ who is innocent and who is guilty.
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I made a promise to myself ____________ this year,my final year in high school,would be different.