4. É possível expressar uma Third Conditional sem utilizar o IF. Nesse caso, use-se a chamada Negative inversion. Qual das alternativas é um exemplo dessa estrutura?
a) Used we had smart themostats, our energy bill would have been smaller.
b) We had used smart themostats, our energy bill would have been smaller.
c) If we had used smart themostats, our energy bill would have been smaller.
d) Had we used smart themostats, our energy bill would have been smaller.
e) N.D.A
a) Used we had smart themostats, our energy bill would have been smaller.
b) We had used smart themostats, our energy bill would have been smaller.
c) If we had used smart themostats, our energy bill would have been smaller.
d) Had we used smart themostats, our energy bill would have been smaller.
e) N.D.A
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D) Had we used smart thermostats, our energy bill would have been smaller