3. This class ________ now. Miss Gao teaches them.A. are studyingB. is studyingC. be studyingD. studying

The correct answer is B. "is studying".

Here's why:

The subject of the sentence is "This class", which is a singular noun. Therefore, we need to use the singular form of the verb "to be", which is "is".

The verb "studying" is in the present continuous tense, which describes an action that is happening right now. The present continuous tense is formed by using the verb "to be" + the present participle (-ing form) of the main verb.

So, the correct sentence is: "This class is studying now. Miss Gao teaches them."

The correct answer is B. "is studying".

Here's why:

The subject of the sentence is "This class", which is singular. Therefore, we need a singular verb to match. In English, the present continuous tense is formed by using "is" (for singular subjects) or "are" (for plural subjects) + the verb in its -ing form.

So, "This class is studying now. Miss Gao teaches them." is the correct sentence.

Option A "are studying" is incorrect because "are" is used for plural subjects. Option C "be studying" is incorrect because "be" is not used in this way in present continuous tense. Option D "studying" is incorrect because it lacks the auxiliary verb "is" needed for the present continuous tense.