__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,w...__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,while i was performing D,to perform 理由是前后主语不
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__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,w...__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,while i was performing D,to perform 理由是前后主语不
__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,w...
__experiments on the laboratoy,it started to rain heavily.
A,while performing B,performing
C,while i was performing D,to perform 理由是前后主语不一致,这也能解释得通.可这样不是就有两个谓语了吗（was 和 started ）.如果按以下这道题分析这个题,不是该选B或A吗：Some students ran back to the dormitory ,magezines___under their arms.
A.to be held B.was held
C.held D.holding
分析：此问题只有一个逗号为简单句,所以只能有一个谓语动词,前面已经有ran作谓语了,
因此空格内只能使用非谓语动词
__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,w...__experiments on the laboratoy,it started to rain heavily.A,while performing B,performing C,while i was performing D,to perform 理由是前后主语不
你可能没注意到2道题的最重要的差别在第一题有一个连词while,第二题没有任何连接词.这就是非常关键的.有连接词,说明是2个分句,既然是2分句,都有各自的谓语动词was,started.然后后面这个句子,无连接词,说明是一个简单句,当然只有一个谓语动词ran,那么后面的是独立主格结构,所以也就不能用谓语动词,只能用非谓语动词,doing,to do,done,此题是杂志被夹在胳膊下,用的是done----held.