The Tiwi geothermal power plant in the Philippines provides a reliable source of renewable energy, yet geothermal plants supply only around 10.1% of the Philippines’ electricity. Indeed, the necessary combination of naturally occurring geological and hydrological features—accessible underground reservoirs, sufficiently high subterranean temperatures, and fractured rocks— relatively rare, effectively limiting the Philippines’ development of new geothermal energy infrastructure.
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Verbal·Standard English Conventions·Form, Structure, and Sense
hardWhich choice completes the text so that it conforms to the conventions of Standard English?
A
proving
B
have proved
C
has proved
D
are proving