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【判断题】
草原生态系统能量流主要通过牧食食物链。A.
正确
B.
错误
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举一反三
【单选题】He commanded that the student _____the classroom before he returned.
A.
didn't leave
B.
wouldn't leave
C.
not leave
D.
can’t leave
【单选题】______, we decided to leave at once, as we didn't want to risk missing the bus.
A.
As it being pretty late
B.
It being pretty late
C.
It was being pretty late
D.
Being pretty late
【单选题】He ______ the key, so we ______ into the office.
A.
hadn’t left; can’t
B.
didn’t leave; couldn’t have got
C.
hadn’t left; couldn’t get
D.
hasn’t left; couldn’t get
【单选题】We didn’t look after the old woman ____ we had an important meeting yesterday. [ ]
A.
as soon as
B.
until
C.
since
D.
so
【简答题】__________, we decided to leave at once, as we didn't want to risk missing the bus. A. As it being pretty late B, It being pretty late C. It was being pretty late D. Being pretty late
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