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【单选题】
下列化合物中,含有氢键的是 ( )A.
H Cl
B.
H 3 BO 3
C.
CH 3 F
D.
C 2 H 4
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【简答题】Who did it? 改为:Tell me______________ .
【单选题】-Is your father a teacher of English in the No.l Middle School? -No! But he _________ English there for ten years.
A.
has taught
B.
has been teaching
C.
taught
D.
had taught
【简答题】用所给词的适当形式填空。 1. Tom`s mother _______ (teach) English in a middle school. 2. I want to go ________ (fish) with my father this Sunday. 3. Jenny has two ________ (knife) in his bag. 4. Kangkang asks me _...
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