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【单选题】
He______two thousand trees since 2001.A.
planted
B.
has planted
C.
will plant
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举一反三
【单选题】I knew how I could improve my English, _________ I didn’t have enough time to spend on it.
A.
and
B.
or
C.
as
D.
but
【简答题】试从实验室检查方面鉴别溶血性黄疸、肝细胞性黄疸和胆汁瘀积性黄疸。
【单选题】_____I knew how to operate an electronic computer as you do I could find a job.
A.
If only
B.
Only if
C.
What if
D.
Since then