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During the course of its growth, a frog undergoes a true metamorphosis ___ with fishlike
larval stage.
(A) begin
(B) began
(C) beginning
(D) is begun.
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Elsy Soteldoa frog undergoes a true metamorphosis
You already have a finite form (undergoes), so the rest of the sentence needs a non-finite form.

If you know this, you can see there is only one choice that can be right.

A) begin finite
(B) began finite
(C) beginning non-finite
(D) is begun finite

CJ
Comments  
C, because 'beginning' here means 'which begins'
Students: We have free audio pronunciation exercises.
 CalifJim's reply was promoted to an answer.
CalifJim Elsy Soteldoa frog undergoes a true metamorphosisYou already have a finite form (undergoes), so the rest of the sentence needs a non-finite form.If you know this, you can see there is only one choice that can be right.A) begin finite(B) began finite(C) beginning non-finite(D) is begun finiteCJ
I didn't know this! Thank you, CJ!