i. Researchers in the US______________a new panel which can harness solar energy even at night. a) invented
b) have invented
c) has invented
ii. The room____________ with noxious fumes. a) filled
b) was filled
c)have filled
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i. Researchers in the US______________a new panel which can harness solar energy even at night. a) invented
b) have invented
c) has invented
ii. The room____________ with noxious fumes. a) filled
b) was filled
c)have filled
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Answer:
has invented
was filled
i) b) have invented....
ii) b) was filled .....
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